"Sixteenth amendment" . "Sixteenth Amendment" . . "The Sixteenth Amendment" . . "income tax amendment" . . . "the Sixteenth Amendment" . . "income tax on individuals and corporations" . . "16th Amendment" . "U.S. Const. Amend. XVI" . . "16th" . . . . "16th Amendment of the Constitution" . "U.S. Const. amend. XVI" . "Sixteenth" . . "16th Amendment to the US Constitution" . . "Sixteenth Amendment to the United States Constitution" . "constitutional amendment to establish an income tax" . "Sixteenth Amendment (income tax)" . "Sixteenth Amendment to the United States Constitution" . "Amendment XVI of the United States Constitution" . "Sixteenth Amendment to the Constitution" . . . "Sixteenth Amendment to the U.S. Constitution" . "16th amendment" .