The Manhattan Project was the project of the first atomic bomb produced by the United States (first utilized in Hiroshima and Nagasaki, eventually influencing the surrender of Japanese forces). This was a major turning point of WWII.
Their greatest goal was to insure that no one would ever be able to come so close to taking over all Europe again.
The PROHIBITION, ratified in 1933, repealed the ban on alcoholic beverages.
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they closed the U.S. airspace for the first time in history.
Martin Luther King Jr. was a Civil Rights activist and a pastor during the Civil Rights era. He was able to help end the segregation of Black Americans who lived in the south. He was know to achieve civil rights through peaceful demonstrations. He has a long résumé of accomplishments. Also when talking about him there were many major events that stand out, a few of them were, he was put in Birmingham prison, his involvement in trying to persuade politicians to pass laws that would help their cause such as voting rights for blacks. He is most noted for a speech he made which was titled "I Have A Dream." Hopefully this helps.