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| 1st |
April Fool's Day
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| 2nd |
Author Hans Christian Andersen's Birthday, 1805
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| 3rd |
Pony Express Established, 1860
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| 4th |
First U.S. Flag Approved, 1818
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| 5th |
Educator Booker T. Washington's Birthday, 1856
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| 6th |
U.S. Entered World War I, 1917
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| 7th |
World Health Day Established, 1948
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| 8th |
Hank Aaron Hit 715th Home Run Breaking Babe Ruth's record,
1974
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| 9th |
Robert E. Lee Surrendered to Ulysses S. Grant, 1865
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| 10th |
U.S. Patent System Established, 1790
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| 11th |
President Johnson Signed the Civil Rights Act, 1968
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| 12th |
Author Beverly Cleary's Birthday, 1916
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| 13th |
3rd President Thomas Jefferson's Birthday, 1743
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| 14th |
Webster's Dictionary Published, 1828
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| 15th |
Artist/Inventor Leonardo da Vinci's Birthday, 1452
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| 16th |
Aviator Wilbur Wright's Birthday, 1867
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| 17th |
Richard the Lion-Hearted Returned to England, 1194
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| 18th |
Paul Revere's Famous Ride, 1775
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| 19th |
Revolutionary War Began, 1775
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| 20th |
Scientists Marie & Pierre Curie Isolate Radium, 1902
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| 21st |
Kindergarten Day, Frederick Froebel's Birthday, 1782
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| 22nd |
Earth Day Established, 1970
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| 23rd |
Author William Shakespeare's Birthday, 1564
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| 24th |
Library of Congress Established, 1800
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| 25th |
Arbor Day
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| 26th |
Scientist Charles Richter's Birthday, 1900
|
| 27th |
Former Military Leader and President Ulysses S. Grant's
Birthday, 1822
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| 28th |
5th President James Monroe's Birthday, 1758
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| 29th |
Zipper Patented, 1913
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| 30th |
Anniversary of the Louisiana Purchase, 1803
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