The powers not [given] to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States
respectively, or to the people. —Constitution of the United States, Amendment X The Tenth Amendment was added to the Bill of Rights because the framers believed in the principle of:
The purpose of the Tenth Amendment is to substantiate the interpretation, that the powers not surrendered to the central government of the United States, and at the same time not forbidden of the State, were fully given to the States or the people.
The above explanation corroborates with the concept of Federalism, which is based on the sharing of powers between the federal government and state governments, such that it allows each state to retain some sort of sovereignty (not entire sovereignty in Confederacy.)
Hence, it can be concluded that The Tenth Amendment was added to the Bill of Rights because the framers believed in the principle of establishing federalism.
American and South Vietnamese forces lost over 3,000 men during the offensive. ... In the wake of the Tet Offensive, support for the U.S. effort in Vietnam began steadily to decline, and public opinion turned sharply against President Johnson, who decided not to run for re-election.
