Ead the excerpt from the preamble to the Constitution.

Insure domestic Tranquility, provide for the common defence, promote the general Welfare.

According to the excerpt, the responsibility of government is to

create and maintain a system that exists to serve state governments.
set up an operating a system that eliminates the need for a strong federal government.
preserve and enforce internal law and order.
maintain internal peace, and support citizens and protect them from foreign threats.