Which amendment protects citizens from being forced to house troops?

The amendment that protects citizens from being forced to house troops is the Third Amendment.

Explanation:

The Third Amendment of the United States Constitution is part of the Bill of Rights, which was added to the Constitution on December 15, 1791. The amendment prohibits soldiers in peace time from being allowed into a house without the owner's permission. The amendment is one of the least controversial parts of the Constitution.

a system of cooperative federalism emerged, as the powers of the federal government expanded.