1. In 1968, Hawaii's first satellite was launched into space on March 21. The satellite called Kukui was built by the University of Hawaii and was part of the first educational satellite project in the United States.

2. March 21, 1794, marks the arrival of Isaac Davis and John Young, two American sailors, on the island of Hawaii to work as advisors and protectors to Kamehameha I. The two men played a crucial role in helping Kamehameha I to unify the Hawaiian Islands.

3. In 1938, March 21 was declared as "International Goodwill Day" by Governor Joseph Poindexter to promote friendship and understanding between Hawaii and other countries.

4. On March 21, 2006, the Hawaii Supreme Court passed a landmark ruling legalizing same-sex civil unions, making Hawaii the second state in the United States to offer legal recognition to same-sex couples.

5. March 21, 1965, marked the completion of the H-1 Freeway, the first major highway built in Hawaii. The 27-mile-long highway connects Honolulu and the western city of Kapolei, easing traffic congestion and providing a faster way of commuting for the residents of Oahu.