1. On August 4, 1959, Hawaii became the 50th state of the United States, after being a US territory for over 50 years.

2. The Battle of Nuʻuanu took place on August 4, 1795. It was a significant battle in Hawaiian history, as it led to the unification of the Hawaiian Islands under King Kamehameha I.

3. August 4 is also celebrated as Hawaiʻi Statehood Day, a public holiday in Hawaii. It is a day to commemorate the state's admission into the United States.

4. In 1909, the first airplane flight in Hawaii took place on August 4. A pilot by the name of Charles Johnson flew his biplane over Honolulu, marking the beginning of aviation in the state.

5. The first official state flag of Hawaii was unveiled on August 4, 1816. The flag featured the Union Jack and stripes of alternating red, white, and blue, symbolizing significance to Hawaii's relationship with the British Empire. However, this flag was later replaced by the current flag, which features the Union Jack along with eight stripes of white, red, and blue, and the state's emblem of a Union Jack representing the unique history of Hawaii.