April 21 is the 111th day of the year. There are 254 days remaining until the end of the year. This date is slightly more likely to fall on a Tuesday, Thursday or Saturday (58 in 400 years each) than on Sunday or Monday (57), and slightly less likely to occur on a Wednesday or Friday (56).
+ 1836 – Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.
+ 1952 – Secretary's Day (now Administrative Professionals' Day) is first celebrated.
+ 1965 – The 1964–1965 New York World's Fair opens for its second and final season.
( Births )
+ 1947 – Iggy Pop, American singer-songwriter, producer, and actor
+ 1951 – Tony Danza, American actor and producer
+ 1963 – Ken Caminiti, American baseball player (d. 2004)
+ 1980 – Tony Romo, American football player