What concept prevents any single branch of government from overpowering others?

The correct answer is checks and balances. This concept is integral to the structure of the United States government as it ensures that no single branch—executive, legislative, or judicial—can gain too much power. Checks and balances are mechanisms that allow each branch to monitor and limit the actions of the others. For instance, while the legislative branch has the power to make laws, the executive can veto legislation, and the judicial branch has the authority to interpret laws and declare them unconstitutional if necessary.

This interplay fosters cooperation and accountability among branches, creating a system that protects against tyranny and promotes the rule of law. It is this dynamic that maintains a balance of power and facilitates a functioning democracy, ensuring that power is not concentrated in one branch at the expense of the others.