The Kentucky and Virginia Resolutions were political statements drafted in 1798 and 1799 in which the Kentucky and Virginia legislatures took the position that the federal Alien and Sedition Acts were unconstitutional. The resolutions argued that the states had the right and the duty to declare unconstitutional those acts of Congress that the Constitution did not authorize. In doing so, they argued for states' rights and strict construction of the Constitution. The Kentucky and Virginia Resolutions of 1798 were written secretly by Vice President Thomas Jefferson and James Madison, respectively.

Thomas Jefferson was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809. He was the primary author of the Declaration of Independence. Following the American Revolutionary War and prior to becoming president in 1801, Jefferson was the nation's first U.S. secretary of state under George Washington and then the nation's second vice president under John Adams.