1. In 1789 on April 30, George Washington was inaugurated as the first president of the United States at Federal Hall in New York City. This momentous event marked the beginning of a new era in American history.

2. On April 30, 1802, the Treaty of Amiens was signed, which ended the hostilities between France and Great Britain during the Napoleonic Wars. The treaty brought a brief period of peace to Europe.

3. In 1812 on April 30, Louisiana became the 18th state to join the Union. The state is known for its unique cultural heritage, including Creole and Cajun traditions.

4. On April 30, 1904, the St. Louis World's Fair opened in Missouri. The fair was a showcase for new inventions, cultures, and technologies from around the world, and was a major cultural event at the turn of the century.

5. In 1975 on April 30, the Vietnam War officially ended when Saigon, the capital of South Vietnam, was captured by North Vietnamese forces. This pivotal event marked the end of American involvement in the conflict and brought about major changes in Southeast Asia.