<Ul> <Li> April 3--The world's first space nuclear power reactor, SNAP - 10A, is launched by the United States from Vandenberg AFB, California . The reactor operates for 43 days and remains in high earth orbit . </Li> <Li> April 5--At the 37th Academy Awards, My Fair Lady wins 8 Academy Awards, including Best Picture and Best Director . Rex Harrison wins an Oscar for Best Actor . Mary Poppins takes home 5 Oscars . Julie Andrews wins an Academy Award for Best Actress, for her portrayal in the role . Sherman Brothers receives 2 Oscars including Best Song, "Chim Chim Cher - ee". </Li> <Li> April 9 <Ul> <Li> In Houston, Texas, the Harris County Domed Stadium (more commonly known as the Astrodome) opens . </Li> <Li> The 100th anniversary of the end of the American Civil War is observed . </Li> </Ul> </Li> <Li> April 11--The Palm Sunday tornado outbreak of 1965: An estimated 51 tornadoes (47 confirmed) hit in 6 Midwestern states, killing between 256 and 271 people and injuring some 1,500 more . </Li> <Li> April 14--In Cold Blood killers Richard Hickock and Perry Smith, convicted of murdering 4 members of the Herbert Clutter family of Holcomb, Kansas, are executed by hanging at the Kansas State Penitentiary for Men in Lansing, Kansas . </Li> <Li> April 17--The first SDS march against the Vietnam War draws 25,000 protestors to Washington, DC . </Li> <Li> April 21--The New York World's Fair in Flushing Meadows reopens . </Li> <Li> April 28--U.S. troops are sent to the Dominican Republic by President Lyndon B. Johnson, "for the stated purpose of protecting U.S. citizens and preventing an alleged Communist takeover of the country", thus thwarting the possibility of "another Cuba". </Li> <Li> April 29--The 6.7 M Puget Sound earthquake affected western Washington with a maximum Mercalli intensity of VIII (Severe), causing seven deaths and $12.5--28 million in financial losses in the Puget Sound region . </Li> </Ul> <Li> April 3--The world's first space nuclear power reactor, SNAP - 10A, is launched by the United States from Vandenberg AFB, California . The reactor operates for 43 days and remains in high earth orbit . </Li> <Li> April 5--At the 37th Academy Awards, My Fair Lady wins 8 Academy Awards, including Best Picture and Best Director . Rex Harrison wins an Oscar for Best Actor . Mary Poppins takes home 5 Oscars . Julie Andrews wins an Academy Award for Best Actress, for her portrayal in the role . Sherman Brothers receives 2 Oscars including Best Song, "Chim Chim Cher - ee". </Li> <Li> April 9 <Ul> <Li> In Houston, Texas, the Harris County Domed Stadium (more commonly known as the Astrodome) opens . </Li> <Li> The 100th anniversary of the end of the American Civil War is observed . </Li> </Ul> </Li>

What was going on in 1965 in the united states