The united Hawaiian monarchy lasted from 1810 until 1893, and included eight kings and queens.
The monarchy ended when Lili'uokalani was deposed by a republican revolution led by Sanford Dole in 1893 as part of a struggle over the future of the islands. Dole became President of Hawaii, and began to campaign for a political union with the United States.This eventually lead to the 1897 treaty of annexation, under which the U.S. took "all rights of sovereignty of whatsoever kind in and over the Hawaiian Islands and their dependencies." The treaty was signed by American ministers.