The U.S. Congress last exercised its power to declare war between December, 1941 and June, 1942 during the advent of America's involvement is World War II. It has not been used since, which means that all U.S. military action since then has been unconstitutional.
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One Constitutional power specifically delegated to the federal government is the power to declare war.
Each state does not have the power to declare war. Only Congress can declare war.
The Congress
The Legislative Branch (Congress) has the power to declare war.
the judicial branch uses its power of judicial review to declare whether or not a law passed by the legislation is constitutional