to expand Medicaid. The Court classified the ACA's language as coercive because it effectively forced States to join the federal program by conditioning the continued provision of Medicaid funds on states agreeing to materially alter Medicaid eligibility to include all individuals who fell below 133% of the poverty line. Nullification The Tenth Amendment has been used as a prominent tool for invoking nullification, or invalidation of any federal laws which that state has deemed unconstitutional with respect to the United States Constitution. Notably, the Tenth Amendment has been successfully utilized to nullify federal laws pertaining to gun rights, immigration, cannabis, and more. See also Principle of conferral State legislation in protest of federal law in the United States States' rights Tenther movement References External links CRS Annotated Constitution: Tenth Amendment Tenth Amendment Center Lindner, Doug. Exploring Constitutional Conflicts 10 Federalism in the United States States' rights 1791 in American law 1791 in American politics