Answer:

Introduction:
Greece gained its independence from the Ottoman Empire in the early 19th century. The Treaty of Constantinople, signed in 1832, marked Greece as an independent nation. This treaty played a significant role in recognizing Greece as a sovereign state and establishing its borders.

Treaty of Constantinople, 1832:
The Treaty of Constantinople, also known as the Treaty of July, was signed on July 21, 1832, between Greece and the Ottoman Empire. It was a result of negotiations following the Greek War of Independence (1821-1830), in which the Greeks fought for their independence from Ottoman rule.

Recognition of Greek Independence:
The Treaty of Constantinople played a crucial role in recognizing Greece as an independent nation. It confirmed the existence of the Kingdom of Greece and established its borders, which included most of the Peloponnese, Central Greece, and the Cyclades islands. This recognition by the Ottoman Empire, which had ruled over Greece for centuries, was a significant milestone for Greek independence.

International Recognition:
The Treaty of Constantinople also gained international recognition for Greece as an independent state. The major European powers, including Britain, France, and Russia, were signatories to this treaty. Their involvement and recognition of Greek independence further solidified Greece's status as a sovereign nation.

Establishment of Monarchy:
The Treaty of Constantinople also addressed the issue of governance in Greece. It established Greece as a monarchy and designated Prince Otto of Bavaria as the first King of Greece. The monarchy was chosen as the form of government to provide stability and continuity in the newly independent nation.

Impact:
The signing of the Treaty of Constantinople had a profound impact on Greece's history. It marked the end of almost four centuries of Ottoman rule and the beginning of a new era for Greece as an independent nation. The treaty's recognition by the Ottoman Empire and international powers played a crucial role in establishing Greece's sovereignty and securing its borders.

Conclusion:
The Treaty of Constantinople, signed in 1832, marked Greece as an independent nation. This treaty recognized Greece's sovereignty, established its borders, and gained international recognition for the newly independent state. It was a significant milestone in Greece's history and played a crucial role in shaping its future as a modern nation.