1. On April 30, 1900, Hawaii officially became a United States territory. This was the result of the Hawaii Organic Act, which established a civilian government for the territory and paved the way for eventual statehood.

2. In 1973, April 30 was designated as Kamehameha Day in Hawaii. This holiday celebrates the life and legacy of King Kamehameha I, who united the Hawaiian Islands under his leadership in the late 18th century.

3. April 30 is also the anniversary of the Hawaiian Renaissance, a cultural movement that began in the 1970s and sought to revive and promote traditional Hawaiian language, arts, and customs. This movement helped to fuel a renewed sense of pride and cultural identity among Native Hawaiians.

4. In 1943, a devastating tsunami struck the Hawaiian Islands on April 30. The tsunami, which was triggered by an earthquake off the coast of the Aleutian Islands in Alaska, caused extensive damage and loss of life in Hilo and other coastal areas.

5. On April 30, 1986, the state of Hawaii enacted the Aloha Spirit Law. This law encourages residents and visitors to embody the aloha spirit of compassion, love, and kindness towards others, and to use these values to guide their interactions and behavior in daily life.