topic: supremacy clause
McCulloch v. Maryland 17 U.S. 316 (1819)
Gibbons v. Ogden 22 U.S. 1 (1824)
Worcester v. Georgia 31 U.S. 515 (1832)
Ableman v. Booth 62 U.S. 506 (1858)
In re Neagle 135 U.S. 1 (1890)
Pennsylvania v. Nelson 350 U.S. 497 (1956)
Printz v. United States 521 U.S. 898 (1997)