1. May 22, 1865: The Grand Review of the Union Army took place in Washington, D.C., marking the end of the American Civil War. Thousands of soldiers marched through the streets of the city in a grand parade, cheered on by crowds of onlookers.

2. May 22, 1900: The first-ever automobile race in the United States was held in the District of Columbia. The race, which was organized by the Automobile Club of America, covered a distance of 54 miles through the streets of the city.

3. May 22, 1924: The Lincoln Memorial was formally dedicated in Washington, D.C. The memorial, which honors the 16th President of the United States, was designed by architect Henry Bacon and sculpted by Daniel Chester French.

4. May 22, 1967: The United States Supreme Court issued its landmark decision in the case of Loving v. Virginia. The court ruled that state laws banning interracial marriage were unconstitutional, paving the way for greater racial equality in the United States.

5. May 22, 1991: The final episode of The Cosby Show aired on NBC, bringing an end to one of the most popular sitcoms in American television history. The show, which starred Bill Cosby as Dr. Heathcliff Huxtable, was known for its family-friendly humor and positive portrayal of African-American life.