Unit 8.1 — Setting the Stage for the Cold War and Decolonization

Unit 7 closed with two world wars and the atomic bombings that ended the second. Unit 8 (1900–present) opens exactly where that left off: the wartime allies who had defeated the Axis powers together were, within months, transforming into the two rival superpowers whose competition would define the rest of the century. Topic 8.1 covers the specific conferences and institutions that set that stage.

Yalta (February 1945): planning a postwar world that already showed cracks

At the Yalta Conference in February 1945, the wartime "Big Three" — Roosevelt, Churchill, and Stalin — met while the war against Germany was still being finished, to plan the reconstruction of postwar Europe and coordinate the final defeat of Japan. Roosevelt specifically pressed for free, democratic elections across Eastern Europe once the fighting ended, but Stalin offered only vague, non-binding assurances on this point — a specific, citable early sign that the wartime alliance's shared goals were already diverging even before the fighting stopped.

Potsdam (July 1945): the alliance's final meeting and its failure to agree

By the Potsdam Conference in July 1945, the alliance's cohesion had weakened further: Roosevelt had died and been replaced by Truman, and the meeting between Truman, Churchill, and Stalin over the future of Europe failed to produce meaningful, binding agreements on the postwar order. This specific diplomatic failure — not a single dramatic event, but a conference that simply couldn't reach real agreement — is the exam's standard marker for when the wartime alliance's unity had genuinely broken down, directly setting up Topic 8.2's Cold War.

The United Nations: a new institution built from the League's failure

Despite the ideological differences already visible at Yalta and Potsdam, the wartime Allies still founded the United Nations in 1945, explicitly intended to replace the League of Nations (Topic 7.5), whose failure to prevent Japanese and German aggression in the 1930s (Topic 7.6) had been thoroughly demonstrated. The UN's creation is worth treating as a genuine attempt at continued cooperation even as the same powers were simultaneously drifting toward rivalry — the postwar order wasn't purely competitive from day one, it contained real cooperative institution-building alongside emerging superpower tension.

Capitalism versus communism: the ideological axis that structures the rest of the unit

The central conflict that would define the next roughly 40 years was ideological: capitalism, championed by the United States, against communism, championed by the Soviet Union. This wasn't primarily a direct military conflict between the two superpowers themselves — the Cold War (Topic 8.2) would instead be characterized by indirect, non-military confrontation: propaganda campaigns, intelligence and covert operations, and a sustained arms race, with both superpowers competing intensely for influence over the many newly independent states that would emerge from the decolonization movements covered later in this unit (Topics 8.5–8.6).

Why this matters for the exam

Topic 8.1 supplies the specific, dated evidence for exactly when and how the World War II alliance broke down: Yalta's vague Soviet promises on Eastern European elections (February 1945), Potsdam's failure to reach binding postwar agreements (July 1945), and the UN's founding as an attempt at cooperation happening in tension with that same breakdown. Keep these as precise causation evidence for Topic 8.2 — the Cold War's origin isn't a single trigger event but a documented diplomatic drift traceable through these two specific 1945 conferences.

Sources: Potsdam Conference, Fiveable — Setting the Stage.