No, they already were US citizens.

In the 1860s we established a coaling station for our navy on the Hawaiian Islands. It was seldom used and the islands sat independent for much of the 19th century. American businessmen moved in and established sugar plantations. In 1890, US Congress passed a tariff on imported sugar, costing these American businessmen a fortune in fees that would be avoided if Hawaii was America.

In 1893 they set a plan in motion to overthrow the legimate government of Hawaii and dispose the queen. They were backed, without congressional approval, by the United States Marine Corp who helped, along with the US Navy's USS Boston, to defeat Royalist Hawaiians for the American plantation owners benefit. The US ship Philidelphia would put down a Royalist revolt in 1895 as well. The imposed government "pleaded" in 1898 for annexation after the outbreak of the Spanish American War. We had tried to deploy troops in the Philippines without a stopover, highlighting the practicality of Hawaii. In 1898, we raised the US flag over Honolulu and later annexed the independent kingdom and imposed territorial status on them. In Nov of 1899 orders were sent to establish Naval Station, Honolulu. Three months later it would change to Naval Station, Hawaii. US Congress then passed a law, "allowing" citizens of Hawaii US citizenship. It reads:

A person born in Hawaii on or after August 12, 1898, and before April 30, 1900, is declared to be a citizen of the United States as of April 30, 1900. A person born in Hawaii on or after April 30, 1900, is a citizen of the United States at birth. A person who was a citizen of the Republic of Hawaii on August 12, 1898, is declared to be a citizen of the United States as of April 30, 1900.

By the time they became a state in the 50's, it was full of citizens.

Ironically, one of the ships that would chart the waters off the coast of Hawaii was the USS Iroquois.