The 1975 settlement and the Iran–Iraq boundary
Distinguish the Algiers agreement, the Baghdad treaty and the settlement’s implementation.
Exam scope and assessment notes
Partial 2026 course: introductory context across the twelve AS topics, with selected document workshops, not full AS or A Level preparation. All three Paper 3 alternatives have introductory context, historiography and original interpretation exercises; Italy, Stalin’s Russia, Hitler’s Germany and Britain have introductory depth pathways across their four enquiries. The USA in the late 1940s/1950s and the 1960s/1970s have introductory American depth pathways; the 1980s/early-1990s theme now introduces all four enquiries with original teaching and two longer essay workshops. All four American themes now have introductory teaching and longer essay workshops, including US foreign policy, 1944–1992. The US–Soviet theme introduces all four enquiries through thirty core lessons and two longer essay workshops. Forty-one lessons introduce all four East and Southeast Asia enquiries: eight on post-war change, nine on Korea, twelve on Vietnam and twelve on Sino-American relations. Eight lessons introduce the African independence enquiry through Ghana, Nigeria, Senegal, Kenya and comparative reasoning. Nine further lessons introduce government, economic and social challenges after independence. Thirteen further lessons introduce Cold War involvement, Chinese support, non-alignment and Pan-Africanism. Twelve further lessons introduce UN involvement in Congo and Somalia, with 1993–1995 explicitly labelled as later context beyond the theme’s 1992 endpoint. Ten lessons introduce the creation-of-Israel enquiry. Twenty further lessons introduce wars and peace efforts in 1948–1979. Seventeen further lessons introduce superpower motives, oil, American and Soviet policies and their consequences through 1991. Twenty-one further lessons introduce the Iranian Revolution, Iran–Iraq War and 1990–1991 Gulf War. All four 2026 Middle East enquiries have introductory lessons; broader reading, depth, specialist review and full assessment remain unfinished. The separate 2027–2029 requirements are not mapped by these 2026 lessons. A separately labelled revised-year orientation and Eastern Europe enquiries 7.1–7.4 introductions and South Africa enquiries 8.1–8.3 and Zimbabwe enquiry 8.4, followed by Malaya enquiry 9.1 and introductory sequences for Malaysia formation enquiry 9.2 and Indonesian nationalism enquiry 9.3, with partial preparation, revolution, 1950s challenges and New Order teaching in enquiry 9.4, are available; other revised teaching remains unfinished. Source summaries are original StudyForA paraphrases, not quotations, complete documents or simulated eyewitness sources. Primary documents, historians’ arguments and original exercises are identified separately. Guided source comparisons, interpretation exercises and analytical models are not full papers, calibrated marking or Cambridge grades. Broader authentic source reading, historical depth and subject-specialist review remain required. Conflict in the Middle East, 1948–1991 is one theme within the International Paper 4 depth study in 2026. The official paper is 105 minutes and 60 marks, with two questions from the chosen depth study. These lessons and original planning briefs introduce Conflict in the Middle East, 1948–1991; broader historical depth, full timed papers and calibrated marking remain unfinished. Develop your own supported judgement using precise evidence, causal relationships and counterarguments. The Paper 4 choice is independent of Paper 3.
Before you begin
- Place events in chronological order
- Distinguish a historical document from a later account and from a student argument
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How should you begin a depth-study argument?
What you will learn
- What are the three main dates in the settlement’s development?
- Why is the thalweg different from ownership of the whole river?
- How important was the boundary dispute in the origins of the Iran–Iraq War? Use the 1975 settlement and compare the factors needed to explain timing.
Build a depth-study argument
- Write your own evidence-based answer before opening the model.
- Define the judgement, connect precise examples, consider counterarguments and explain the relative weight of the evidence. The original brief is a planning aid, not a historical source to quote as testimony.
Partial 2026 course: introductory context across the twelve AS topics, with selected document workshops, not full AS or A Level preparation. All three Paper 3 alternatives have introductory context, historiography and original interpretation exercises; Italy, Stalin’s Russia, Hitler’s Germany and Britain have introductory depth pathways across their four enquiries. The USA in the late 1940s/1950s and the 1960s/1970s have introductory American depth pathways; the 1980s/early-1990s theme now introduces all four enquiries with original teaching and two longer essay workshops. All four American themes now have introductory teaching and longer essay workshops, including US foreign policy, 1944–1992. The US–Soviet theme introduces all four enquiries through thirty core lessons and two longer essay workshops. Forty-one lessons introduce all four East and Southeast Asia enquiries: eight on post-war change, nine on Korea, twelve on Vietnam and twelve on Sino-American relations. Eight lessons introduce the African independence enquiry through Ghana, Nigeria, Senegal, Kenya and comparative reasoning. Nine further lessons introduce government, economic and social challenges after independence. Thirteen further lessons introduce Cold War involvement, Chinese support, non-alignment and Pan-Africanism. Twelve further lessons introduce UN involvement in Congo and Somalia, with 1993–1995 explicitly labelled as later context beyond the theme’s 1992 endpoint. Ten lessons introduce the creation-of-Israel enquiry. Twenty further lessons introduce wars and peace efforts in 1948–1979. Seventeen further lessons introduce superpower motives, oil, American and Soviet policies and their consequences through 1991. Twenty-one further lessons introduce the Iranian Revolution, Iran–Iraq War and 1990–1991 Gulf War. All four 2026 Middle East enquiries have introductory lessons; broader reading, depth, specialist review and full assessment remain unfinished. The separate 2027–2029 requirements are not mapped by these 2026 lessons. A separately labelled revised-year orientation and Eastern Europe enquiries 7.1–7.4 introductions and South Africa enquiries 8.1–8.3 and Zimbabwe enquiry 8.4, followed by Malaya enquiry 9.1 and introductory sequences for Malaysia formation enquiry 9.2 and Indonesian nationalism enquiry 9.3, with partial preparation, revolution, 1950s challenges and New Order teaching in enquiry 9.4, are available; other revised teaching remains unfinished. Source summaries are original StudyForA paraphrases, not quotations, complete documents or simulated eyewitness sources. Primary documents, historians’ arguments and original exercises are identified separately. Guided source comparisons, interpretation exercises and analytical models are not full papers, calibrated marking or Cambridge grades. Broader authentic source reading, historical depth and subject-specialist review remain required.
Enquiry brief and analytical model
This is an original StudyForA enquiry brief, not a quotation, a primary document or a historian’s extract. Use it to plan your own argument and read the linked evidence. Conflict in the Middle East, 1948–1991 is one theme within the International Paper 4 depth study in 2026. The official paper is 105 minutes and 60 marks, with two questions from the chosen depth study. These lessons and original planning briefs introduce Conflict in the Middle East, 1948–1991; broader historical depth, full timed papers and calibrated marking remain unfinished. Develop your own supported judgement using precise evidence, causal relationships and counterarguments. The Paper 4 choice is independent of Paper 3.
StudyForA enquiry brief · The 1975 settlement and the Iran–Iraq boundary
[1] Original analytical brief. Distinguish the Algiers agreement, the Baghdad treaty and the settlement’s implementation. Develop a supported judgement using the linked evidence and its limits. This is StudyForA teaching prose, not a contemporary document or a historian’s extract. Write before opening the model.
1. How important was the boundary dispute in the origins of the Iran–Iraq War? Use the 1975 settlement and compare the factors needed to explain timing.
Compare after trying
The 1975 settlement mattered because it addressed boundaries and security together. The March Algiers communiqué was followed by the June Baghdad treaty, which entered into force in June 1976. Keeping those stages separate avoids turning a diplomatic sequence into one inaccurately labelled event.
The selected English translation shows a settlement linking land, river and frontier-security provisions. The thalweg boundary was not equivalent to assigning the whole Shatt al-Arab to one state. Stated permanence and dispute procedures reveal the parties’ undertakings, but cannot guarantee compliance or lasting political friendship.
The settlement therefore provides important context for the later war without explaining its timing by itself. An answer must compare territorial disputes with revolutionary change, strategic ambition and leaders’ calculations about vulnerability. It should also distinguish allegations, unilateral declarations and evidence of responsibility. The selected articles establish the framework; they do not amount to a complete technical boundary survey or a specialist judgement about every subsequent breach.
Why this response fits
- Connect evidence to a specific causal mechanism and outcome.
- Compare explanations and keep contemporary claims, later interpretation and verified events distinct.
- This original analytical model is not a calibrated examination script or Cambridge grade.
A sequence of agreements addressed more than one issue
The Algiers communiqué of 6 March 1975 preceded a treaty signed at Baghdad on 13 June. The treaty entered into force on 22 June 1976 through exchange of ratification instruments in Tehran. These are different stages: political agreement, signature and legal entry into force. Calling all of them a treaty signed at Algiers in March loses the distinction between the original settlement and its later legal instruments.
The selected English UN Treaty Series text is a translation; French is the authentic text. The treaty linked the land frontier, river frontier and frontier security as parts of an overall settlement. The security provision addressed cross-border infiltration. This helps explain why disagreements involved sovereignty and interference as well as the course of a waterway. It does not prove that every subsequent allegation of interference was true.
Understand the thalweg without inventing ownership of the whole river
The river protocol delimited the Shatt al-Arab frontier along the thalweg, defined in the text through the main navigable channel. A boundary within a waterway is different from assigning the entire river to one state. The distinction matters because simplified maps can turn a shared navigational setting into a claim of exclusive sovereignty. Read the protocol and map conventions before drawing conclusions from a coloured line.
The treaty described the frontier settlement as permanent and provided staged means of resolving disputes. Those provisions show what the parties undertook, not a guarantee that political relations would remain friendly. A legal instrument can be durable in its stated terms while leaders later challenge it. Conversely, a unilateral declaration against an agreement is not by itself proof that every legal obligation has disappeared.
Connect the settlement with the later conflict
The 1975 settlement supplies context for the boundary dispute preceding Iraq’s 1980 invasion. It should be compared with political change in Iran and Iraqi calculations, rather than treated as a sufficient explanation on its own. A pre-existing dispute helps identify the object of contention; it does not explain why a government chose large-scale war at a particular moment. Timing requires evidence about decisions and perceived opportunities.
For an analytical answer, separate agreement, implementation, alleged breach and responsibility for force. Each requires different evidence. This lesson reads the treaty’s main articles and opening river-protocol provisions, not every technical annex or chart in the long volume. It therefore establishes the structure and main dates of the settlement without claiming a complete boundary survey or a specialist legal ruling on all later disputes.
Sources for this lesson
- Cambridge History 9489 · 2026 Version 3 · content pp. 9–41, assessment pp. 43–45, changes p. 52
- Cambridge History 9489 · December 2025 update · 2026 only
- Iran–Iraq treaty, Baghdad, 13 June 1975 · UNTS 1017 no.14903, selected English translation pp.136–140: main articles and opening river protocol; French authentic. March communiqué, June signature and 22 June 1976 entry distinguished; not every technical annex or chart read
- Saskia M. Gieling, Encyclopaedia Iranica, Iran–Iraq War · selected causes, 1981–1982 recovery and continuation sections; later scholarly synthesis. Its inconsistent opening/ceasefire and 1990 date shorthand is not adopted; actual ceasefire independently checked as 20 August 1988. No precise combined casualty or force total adopted
Pause and explain
Which label preserves the treaty’s provenance?
Worked example
What are the three main dates in the settlement’s development?
Show the worked solution
- 6 March 1975 communiqué.
- 13 June Baghdad treaty.
- 22 June 1976 entry into force.
Answer The Algiers communiqué came on 6 March 1975, the treaty was signed at Baghdad on 13 June, and it entered into force on 22 June 1976. Distinguishing agreement, signature and ratification prevents a timeline from treating all three as the same legal event in the same place.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Guided: What are the three main dates in the settlement’s development?
Give me a hint
Separate political and legal stages.
Compare my reasoning
- 6 March 1975 communiqué.
- 13 June Baghdad treaty.
- 22 June 1976 entry into force.
The Algiers communiqué came on 6 March 1975, the treaty was signed at Baghdad on 13 June, and it entered into force on 22 June 1976. Distinguishing agreement, signature and ratification prevents a timeline from treating all three as the same legal event in the same place.
Look for these in your work
- Uses specific dated evidence
- Explains the mechanism and retains the stated limit
Independent: Why is the thalweg different from ownership of the whole river?
Give me a hint
Identify a boundary inside a navigable waterway.
Compare my reasoning
- Locate the main channel.
- Separate boundary and navigation.
- Avoid exclusive-sovereignty shorthand.
The selected protocol locates a frontier along the main navigable channel rather than awarding the whole Shatt al-Arab to one state. A map must preserve that distinction. Boundary location and navigation arrangements are related questions, but neither should be replaced by a claim of exclusive ownership without evidence.
Look for these in your work
- Uses specific dated evidence
- Explains the mechanism and retains the stated limit
Transfer: Does a continuing boundary dispute alone explain the choice of war in 1980?
Give me a hint
Distinguish background and timing.
Compare my reasoning
- Identify the dispute.
- Add the changed political setting.
- Investigate leaders’ decisions.
A boundary dispute identifies an issue in contention but does not by itself explain why leaders chose full-scale invasion in September 1980. The timing requires comparison with revolutionary change, strategic ambitions and perceptions of vulnerability. A causal account must explain a decision rather than assume that a disputed boundary always produces war.
Look for these in your work
- Uses specific dated evidence
- Explains the mechanism and retains the stated limit
Common mistakes
- Combining communiqué and treaty dates
- Equating a river frontier with exclusive ownership
- Claiming every technical annex was read
What can you explain now?
Which label preserves the treaty’s provenance?
Compare with the explanation
An English translation of a French-authentic treaty signed at Baghdad in June 1975
The selected UN Treaty Series record separates signature, language and entry into force.
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Make it stick
Which label preserves the treaty’s provenance?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.