Final answer:
The American Anti-Imperialist League would view the United States' annexation of territories like the Philippines and Puerto Rico as 'criminal aggression' because it contravenes the principles of liberty, self-governance, and consent of the governed.
Step-by-step explanation:
The American Anti-Imperialist League consider the United States' annexation of territories following the Spanish-American War as “criminal aggression”. This includes actions such as the taking of the Philippines, Guam, Puerto Rico, and the annexation of Hawaii.
The League believed that imperialism was in direct opposition to the foundational principles of liberty and self-governance that the United States was built upon. They would argue that such actions deny the people of these annexed territories the right to consent to their own governance, a right that is central to democratic principles and the Declaration of Independence.