Final answer:
The controversy concerning annexing the Philippines in the early twentieth century showed that imperialism was an accepted practice and that imperialist supporters led national political parties. Anti-imperialist voices were present but did not dominate the national government.
Step-by-step explanation:
The controversy concerning annexing the Philippines revealed that imperialism was an accepted practice during the era, despite some objections. It demonstrated that imperialist supporters led both national political parties. Anti-imperialist voices did exist but they did not dominate the national government. The United States did not prioritize the wishes of the people of the Philippines when it came to annexation.
Learn more about Annexation of the Philippines in the early twentieth century