Answer:
Federalism
Step-by-step explanation:
Federalism is where the governmental powers are separated between two different levels of government
Separation of powers would be splitting the powers into different branches, which for the national level would be the executive branch, legislative branch, and judicial branch
Checks and balances is where the different branches has power over each other, like how the legislative branch can impeach the president, or the executive branch can veto a bill from the legislative
Popular sovereignty is where the governmental powers comes from the power, which would be U.S. citizens voting for congress and the president