How did the constitution limit the power of government through a separation of powers and a system of checks and balances

Ineed asap ! name the differences between communism and fascism. 1who controls the government and how do they stay in power? 2how are the people’s personal lives and decisions affects? 3what is the government’s view on the economy and how it should be handled? 4what is the government’s view on other countries and their relationship with them?