Answer:
The United States Constitution
Step-by-step explanation:
The document that provided a model plan of government to other nations is the United States Constitution. The Constitution of the United States, ratified in 1788, established a framework for the federal government and outlined the powers and structure of its branches. It served as a model for many other countries around the world as they sought to establish or revise their own systems of government. The principles of the U.S. Constitution, such as separation of powers, checks and balances, and individual rights, have influenced the development of constitutional law and governance in numerous countries.