First African slaves in North America (c. 1526)
The ‘Mayflower’ arrives in America (November 1620)
The Wright Brothers’ Flight (1903)
Prohibition (January 16th 1920 to March 22 1933)
Jonas Salk’s Polio Vaccine (April 12th, 1955)
Martin Luther King’s ‘I Have a Dream Speech’ (August 28th, 1963)
Apollo 11 Lands on the Moon (1969)
Watergate Scandal (June 17th 1972 – August 9th 1974)
Virginia Tech Massacre(April 16th 2007)