Which of these constitutions was modeled after the U.S. Constitution?

The Constitution of 1789 is indeed the document that was modeled after the U.S. Constitution. The U.S. Constitution, ratified in 1788, served as a foundational legal framework for other states and territories, influencing their governance structures, principles, and organization of the government. The 1789 Constitution for Georgia reflected similar ideals regarding federalism, separation of powers, and checks and balances as established by the U.S. Constitution. It aimed to create a structured and balanced government that aligned with the democratic principles laid out at the national level.

The other options represent different historical contexts and constitutional frameworks. The Constitution of 1777 was Michigan's first constitution, predating the U.S. Constitution, and had a significantly different structure and focus. The Constitution of 1798 was the last of Georgia's constitutions before the Civil War, but it also did not directly model itself on the U.S. Constitution in the same way that the 1789 version did. Lastly, the Constitution of 1861 was influenced by the sectional conflicts of the time and reflected the Confederacy's issues and principles, further deviating from the original model of the U.S. Constitution.