Events that impacted the Constitution

1791 The Bill of Rights

1865-70 The Civil War Amendments

1913 The Sixteenth Amendment -- Federal Income Tax

1919 The Eighteenth Amendment -- Prohibition

1920 The Nineteenth Amendment -- Women's Vote

1964 The Twenty-Fourth Amendment -- Poll Tax Outlawed

1971 The Twenty-Sixth Amendment -- 18-year-old voting age

1972 The Equal Rights Amendment