1. In 1826, American missionary William Patterson arrived in Hawaii on April 9th. He and his wife established the first Protestant mission station on Kauai, and later helped to translate the Bible into the Hawaiian language.

2. On April 9, 1865, news reached Hawaii that Confederate General Robert E. Lee had surrendered to Union General Ulysses S. Grant at Appomattox Courthouse, effectively ending the American Civil War. This news was greeted with mixed emotions in Hawaii, as some residents were sympathetic to the Southern cause.

3. In 1905, on April 9th, the first all-Hawaiian Hawaiian Homestead was established in Kapaa, Kauai. This program was created to provide land and assistance to Native Hawaiians who were struggling to support themselves and their families.

4. On April 9, 1942, the Japanese submarine I-26 fired its first shells at Hawaii, striking a tanker and causing minor damage. This incident marked the first time that Hawaii had been attacked during World War II.

5. In 2005, on April 9th, the Hawaii Superferry was launched. This high-speed passenger and vehicle ferry operated between Oahu and Maui, but faced controversy and legal challenges due to concerns over environmental impacts and lack of community consultation. The ferry ceased operations in 2009.