1. May 6, 1882: President Chester A. Arthur signed the Chinese Exclusion Act, which suspended Chinese immigration to the United States for 10 years. The act stated that Chinese laborers were prohibited from entering the country and become US citizens. This act was the first federal law that restricted immigration based on race and nationality.

2. May 6, 1908: The first annual meeting of the American Society of International Law took place in Washington, D.C. The society was established to promote the study and understanding of international law, and to foster cooperation among lawyers and scholars from around the world.

3. May 6, 1933: President Franklin D. Roosevelt signed an executive order creating the Works Progress Administration (WPA), which employed millions of people during the Great Depression to carry out public works projects, including the construction of roads, bridges, schools, and parks.

4. May 6, 1954: The Supreme Court of the United States handed down its landmark decision in Brown v. Board of Education. The court ruled that segregated schools were inherently unequal and violated the 14th Amendment to the Constitution. The decision paved the way for desegregation in public schools across the country.

5. May 6, 1994: The first public event celebrating Cinco de Mayo took place in Washington, D.C. Cinco de Mayo commemorates the Mexican army's victory over French forces at the Battle of Puebla on May 5, 1862. The holiday has become a popular cultural celebration in the United States, particularly in areas with large Mexican-American populations.