Why were some people unhappy about Manifest Destiny?

They thought the the Americans were being cruel to the Native Americans

answer: choose the second bullet point. it is the easiest to put together an answer to the question.

explanation:

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.