1. The Battle of Pleasant Hill occurred on April 9, 1864, during the American Civil War. Confederate forces attempted to halt Union General Banks' advance towards Shreveport, Louisiana, but were ultimately defeated.

2. On April 9, 1865, General Robert E. Lee surrendered to General Ulysses S. Grant, effectively ending the Civil War. This event is commemorated every year as National Civil War Remembrance Day.

3. On April 9, 1947, Jackie Robinson broke the color barrier in professional baseball by making his debut with the Brooklyn Dodgers. Robinson, an African American, faced discrimination and hostility but paved the way for future generations of black athletes.

4. In 1962, Georgia native James Andrews and his band The Major Toms recorded the first known version of "Louie Louie," a hit song that has since been covered by countless artists.

5. The Masters, one of the most prestigious golf tournaments in the world, traditionally begins on the second Sunday of April, which often falls on April 9 or close to it. The tournament has been held annually at Augusta National Golf Club in Augusta, Georgia since 1934.