1. In 1884, the Hawaiian Kingdom signed a treaty with the United States, allowing for free trade and the importation of labor. This treaty helped to solidify the strong economic ties between Hawaii and the US.

2. In 1943, the US Army installed a radar station in Honolulu to monitor Japanese naval movements during World War II. This was a key component in the Allied victory in the Pacific, allowing for advanced warning of enemy attacks.

3. In 1965, the first Polynesian Cultural Center opened in Laie, Oahu. This center is dedicated to preserving and sharing the traditional ways of life of the Polynesian peoples, including Hawaiian, Samoan, Tongan, and Maori cultures.

4. In 2005, Hawaii became the first state in the US to ban the use of handheld cell phones while driving. This law was aimed at reducing distracted driving and improving road safety in Hawaii.

5. In 2018, heavy rains and flooding caused widespread damage across Hawaii, particularly on the island of Kauai. Many roads were washed out, homes were destroyed, and several people were reported missing. The disaster highlighted the vulnerability of Hawaii's infrastructure to extreme weather events.