April 1st 1865: During the American Civil War, Confederate troops of General George Pickett were defeated and cut off at Five Forks, Virginia.

April 2nd 1513: Spanish explorer Ponce De Leon sighted Florida and claimed it for the Spanish Crown after landing at the site of present day St. Augustine, now the oldest city in the continental U.S.

April 3rd 1865: The Confederate capital of Richmond surrendered to Union forces after the withdrawal of General Robert E. Lee’s troops.

April 4th 1887: The first woman mayor was elected in the U.S. as Susanna M. Salter became mayor of Argonia, Kansas.

April 5th 1986: A bomb exploded at a popular discotheque frequented by American military personnel in West Berlin, killing two U.S. soldiers and a Turkish woman. 

April 6th 1896: After a break of 1500 years, the first Olympics of the modern era was held in Athens, Greece.

April 7th 1712: In New York City, 27 black slaves rebelled, shooting nine whites as they attempted to put out a fire started by the slaves. 

April 8th 1952:  President Harry S. Truman seized control of America’s steel mills to prevent a shutdown by strikers.

April 9th 1865: After over 500,000 American deaths, the Civil War effectively ended as General Robert E. Lee surrendered to General Ulysses S. Grant in the village of Appomattox Court House.

April 10th 1942: During World War II in the Pacific, the Bataan Death March began as American and Filipino prisoners were forced on a six-day march from an airfield on Bataan to a camp near Cabanatuan.

April 11th 1968: A week after the assassination of Martin Luther King, the Civil Rights Act of 1968 was signed into law by President Lyndon B. Johnson.

April 12th 1861: The American Civil War began as Confederate troops under the command of General Pierre Beauregard opened fire at 4:30 a.m. on Fort Sumter in Charleston, South Carolina.

April 13th 1743-1826:  Thomas Jefferson was born in Albemarle County, Virginia. 

April 14th 1775: In Philadelphia, the first abolitionist society in America was founded as the “Society for the relief of free Negroes unlawfully held in bondage.”‘

April 15th 1817: The first American school for the deaf was founded by Thomas H. Gallaudet and Laurent Clerc in Hartford, Connecticut.

April 16th 1862: Congress abolished slavery in the District of Columbia and appropriated $1 million to compensate owners of freed slaves.

April 17th 1961: A U.S. backed attempt to overthrow Premier Fidel Castro of Cuba failed disastrously in what became known as the Bay of Pigs fiasco.

April 18th 1775: The Midnight Ride of Paul Revere and William Dawes occurred as the two men rode out of Boston about 10 p.m. to warn patriots at Lexington and Concord of the approaching British.

April 19th 1943: Jews in the Warsaw Ghetto staged an armed revolt against Nazi SS troops attempting to forcibly deport them to death camps.

April 20th 1914: Miners in Ludlow, Colorado, were attacked by National Guardsmen paid by the mining company.

April 21st 1836: The Battle of San Jacinto between Texans led by Sam Houston and Mexican forces led by Santa Anna took place near present day Houston. 

April 22nd 1864: “In God We Trust” was included on all newly minted U.S. coins by an Act of Congress.

April 23rd (1791-1868) : James Buchanan the 15th U.S. President was born in Cove Gap, Pennsylvania.

April 24th 1800: The Library of Congress was established in Washington, D.C.

April 25th 1967: The first law legalizing abortion was signed by Colorado Governor John Love, allowing abortions in cases in which a panel of three doctors unanimously agreed.

April 26th 1937: During the Spanish Civil War, the ancient town of Guernica was attacked by German warplanes. 

April 27th 1865: On the Mississippi River, the worst steamship disaster in U.S. history occurred as an explosion aboard the Sultana killed nearly 2,000 passengers, mostly Union soldiers who had been prisoners of war and were returning home.

April 28th 1945:  Twenty-three years of Fascist rule in Italy ended abruptly as Italian partisans shot former Dictator Benito Mussolini.

April 29th 1992: Riots erupted in Los Angeles following the announcement that a jury in Simi Valley, California, had failed to convict four Los Angeles police officers accused in the videotaped beating of an African American man.

April 30th 1789: George Washington became the first U.S. President as he was administered the oath of office on the balcony of Federal Hall at the corner of Wall and Broad Streets in New York City.

Cites: https://www.historyplace.com/specials/calendar/april.htm

http://justfunfacts.com/interesting-facts-about-april/