1. In 1850, the first Catholic church in the Kona district of the Big Island was consecrated. The church, named St. Michael the Archangel, was built on land donated by Henry Nicholas Greenwell.

2. On May 21, 1881, the schooner Kamokuna arrived in Honolulu harbor with a load of sugar cane from the island of Kauai. This marked the beginning of the modern sugarcane industry in Hawaii.

3. In 1894, Queen Liliuokalani visited Maui and was greeted by a large crowd at Wailuku. She spoke to the people in both English and Hawaiian, encouraging them to take pride in their traditions and culture.

4. May 21, 1915, marked the opening of the Hawaii Agricultural Experiment Station in Honolulu. This was the first research center of its kind in the Pacific region, and it played a crucial role in developing new farming techniques and crop varieties suited to Hawaii's unique climate.

5. On this day in 1943, the US Navy launched a new battleship, the USS Missouri, in Brooklyn, New York. The ship would later become famous as the site of the Japanese surrender ceremony at the end of World War II, which took place in Tokyo Bay on September 2, 1945.