1. The Battle of Kuamo'o took place on June 23, 1819, on the island of Hawaii, resulting in the victory of Kamehameha II over traditionalists who opposed religious and political changes.

2. On June 23, 1874, King Kalakaua signed a treaty with Japan, establishing formal diplomatic relations between the two nations and marking the beginning of a strong economic and cultural exchange.

3. The Hawaiian Volcano Observatory was founded on June 23, 1912, by Thomas Jaggar, a geologist who dedicated his life to studying the Kilauea Volcano, one of the most active and dangerous volcanoes in the world.

4. June 23, 1931, marks the opening of the iconic Royal Hawaiian Hotel, a luxury resort in Waikiki that became a symbol of Hawaii tourism and hospitality, hosting celebrities, politicians, and businessmen from all over the world.

5. On June 23, 1993, President Bill Clinton signed the Apology Resolution, formally apologizing for the United States' involvement in the overthrow of the Hawaiian monarchy in 1893 and recognizing the rights of native Hawaiians to self-determination and cultural preservation.