The Treaty of Constantinople of 1832 recognised Greece as an independent nation by formally ending Greek subjugation under the Ottoman Empire, which had controlled Greece since the fifteenth century. The Greek struggle, which began in 1821, received support from West Europeans, poets, and artists, and was finally concluded by this treaty granting Greece independence.
Source: Chapter 1 – Nationalism in Europe, Section on Greek War of Independence
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The question asks you to explain how the treaty recognised Greece — so briefly state the background (Ottoman rule, struggle since 1821, European support) and then the outcome (formal recognition of independence). Don't just quote the treaty name; examiners want context + result. Two marks = two clear points: (1) Greece was under Ottoman rule and fought for independence, (2) the 1832 treaty formally recognised it as an independent nation.