1. In 1789, George Washington was inaugurated as the first President of the United States on April 30 in New York City. The inauguration took place at Federal Hall in Lower Manhattan, which served as the nation's first capital.

2. In 1803, the Louisiana Purchase was signed on April 30 in New York City. The agreement between the United States and France doubled the size of the country and paved the way for westward expansion.

3. On April 30, 1900, the first New York City subway line opened to the public. The line ran from City Hall to Harlem and cost a nickel to ride. Today, the subway is the largest public transportation system in the world.

4. In 1939, the World's Fair opened in Flushing Meadows-Corona Park in Queens on April 30. The fair was held to celebrate the 150th anniversary of George Washington's inauguration and showcased futuristic technology and international cultures.

5. On April 30, 1977, the first Jazz Fest was held in New Orleans. The festival was founded by George Wein, a jazz pianist and concert promoter from New York City. Today, the New Orleans Jazz & Heritage Festival is one of the largest and most respected music festivals in the world.