The Anti-Imperialist League was first founded in opposition to the government's planned annexation of the Philippines. Prominent members, such as author Mark Twain, believed that imperialism violated US principles of self-determination and independence.
1. The Anti-Imperialist League was established in response to the government's intent to annex the Philippines.
2. Mark Twain, a notable member of the league, argued against imperialism as he believed it went against principles of self-determination and independence.