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Oahu known as "The Gathering Place", is the third largest of the Hawaiian Islands and most populous of the islands in the State of Hawaiʻi. The city of Honolulu—largest city, state capital, and main deepwater marine port for the State of Hawaiʻi—is located here.
Well-known features found on Oʻahu include Waikīkī, Pearl Harbor, Diamond Head, Hanauma, Kāneʻohe Bay, Kailua Bay, North Shore.
Today, Oʻahu has become a tourism and shopping haven as over 5 million visitors (mainly from the American mainland and Japan).
The old Kingdom of Oʻahu was once ruled by the most ancient Aliʻi in all of the Hawaiian Islands. The first great king of Oʻahu was Mailikukahi, the law maker, who was followed by many generation of monarchs. Kualii was the first of the warlike kings and so were his sons. In 1773, the throne fell upon Kahahana, the son of Elani of Ewa. In 1783 Kahekili II, King of Maui, conquered Oʻahu and deposed the reigning family and then made his son Kalanikupule king of Oʻahu. Kamehameha the Great would conquer in the mountain Kalanikupule's force in the Battle of Nuʻuanu. Kamehameha founded the Kingdom of Hawaiʻi with the conquest of Oʻahu in 1795. Hawaiʻi would not be unified until the islands of Kauaʻi and Niʻihau surrendered under King Kaumualii in 1810. Kamehameha III moved his capital from Lāhainā, on Maui to Honolulu, Oʻahu in 1845. ʻIolani Palace, built later by other members of the royal family, is still standing, and is the only royal palace on American soil.