structural:expansion
American opposition

Some Americans, notably William Jennings Bryan, Mark Twain, Andrew Carnegie, Ernest Crosby, and other members of the American Anti-Imperialist League, strongly objected to the annexation of the Philippines. Anti-imperialist movements claimed that the United States had become a colonial power.

Some anti-imperialists opposed annexation on racist grounds. Among these was Senator Benjamin Tillman of South Carolina, who feared that annexation of the Philippines would lead to an influx of non-white immigrants into the United States. Others worried that annexing the Philippines would lead to the non-white population having a say in the American government.

As news of atrocities committed in subduing the Philippines arrived in the United States, support for the war flagged.