Question

how did the white planter class in hawaii assist us efforts to annex the island?
they convinced president
cleveland that the hawaiian
monarchy was engaging in acts
of war.
they held king kamehameha iii
at gunpoint and forced him to
sign over pearl harbor to the us.
they convinced king
kamehameha iii to approve a
new constitution and sign
agreements that benefited the
us.

Explanation:

The White planter class in Hawaii was involved in political maneuvering. They convinced King Kamehameha III to approve a new constitution and sign agreements that benefited the US. This was part of their efforts to align with US interests, which in turn helped the US in its annexation efforts. The first option about convincing President Cleveland of acts of war is not accurate as the main actions were more about constitutional changes and agreements. The second option about holding the king at gunpoint and forcing Pearl Harbor sign - over is also incorrect. The key was the constitutional and agreement - based approach.

Answer:

They convinced King Kamehameha III to approve a new constitution and sign agreements that benefited the US.