In 1850, Kamehameha III declared Honolulu to be the official capital of the Kingdom of Hawaiʻi. With the proclamation came a series of investments to further develop the harbor to accommodate more vessels. Honolulu Harbor quickly became the chief port of call for the trans-Pacific sandalwood, fur and whaling industries. Foreign vessels that docked at Honolulu Harbor poured vast amounts of wealth into the kingdom's coffers and provided for the well-being of native Hawaiians. The British subsequently built a fort to protect the entrance to the harbor.