"The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
This text is similar to a provision in the Articles of Confederation:
"Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegate to the United States, in Congress assembled."
The 10th Amendment states that the federal government is limited only to the powers granted in the Constitution.
In my opinion, the idea of cooperative federalism, which is the system in which Congress and the states work within these days, is unconstitutional. Cooperative federalism is a system in which Congress attempts to exercise its power by offering or encouraging the States to implement national programs, often through funding, or lack of funding. For instance, funds for highway improvement were withheld unless the States implements such national standards such as the national speed limit and the nationwide legal drinking age.
State Sovereignty resolutions have been introduced in 37 states since October 2009. 7 states have passed such resolutions (Alaska, Idaho, North Dakota, South Dakota, Oklahoma, Louisiana, and Tennessee).
The 10th Amendment Center is an organization that promotes the idea of state sovereignty and gathers information about actions taken by the states to protest federal involvement in their governments.