Final answer:
Federalists supported separation of powers to avoid the emergence of any tyrannical power within the government and to maintain a balance that would ensure liberty and effective governance.
The central government to avoid monarchy, is the correct answer.
Step-by-step explanation:
The Federalists believed in the separation of powers mainly to prevent any single branch of the government from gaining too much power, thus averting any potential emergence of a tyranny or monarchy-like power. They aspired to create a balanced system where the powers vested in the central government would keep the nation stable and allow for effective governance, particularly in foreign affairs, without overstepping the liberties of the people. The essays known as the Federalist Papers—written by Alexander Hamilton, James Madison, and John Jay—articulated these principles, explaining how a strong central government that is also fundamentally federal was essential for diplomatic and domestic prosperity, and emphasizing the checks and balances that would prevent tyranny.