Answer:
There are several reasons why we might oppose to the annexation of Hawaii by the United States government. Some of this could be:
The fact that all people and nations have the right to govern themselves. Hawaiians deserve to make their own decisions.
The deposition of Queen Liliuokalani was forceful, and did not follow democratic or legal procedures.
A treaty of friendship, as existed originally, already gives the United States many privileges in terms of trade.
The economy of Hawaii was already very integrated to that of the United States.
A new state in the country represents a significant expense for the federal government.