Hawaii's government was a monarchy up until 1893. Queen Liliuokalani was the last queen that Hawaii had before she was overthrown by a party of American businessmen who demanded a provisional government.
We want a provisional government
After the Americans overthrew the queen they wanted to annex Hawaii but the Native Hawaiians did not want to be annexed so they made a petition that did not allow the US annex Hawaii.
The Hawaiian's success was short lived because after the USS Maine was blown up it indicated the start of the Spanish American war and the US needed to have a mid pacific fueling and naval base. The Hawaiian islands were the number one choice and a joint resolution was established where Hawaii was officially annexed, howevver they werre not yet considered a state
Hawaii was a United States territory until 1959 when it was finally brought in as a state