more or less became an empire following the Spanish American War.
The U.S. wouldn't even let Filipino rebel fighters into Manila when the Spanish American War ended.
http://en.wikipedia.org/wiki/Spanish_American_War
Commodore Dewey transported Emilio Aguinaldo, a Filipino leader who had led rebellion against Spanish rule in the Philippines in 1896, to the Philippines from exile in Hong Kong to rally more Filipinos against the Spanish colonial government.[55] By June, U.S. and Filipino forces had taken control of most of the islands, except for the walled city of Intramuros. On June 12, Aguinaldo proclaimed the independence of the Philippines.[56][57]
On August 13, with American commanders unaware that a cease-fire had been signed between Spain and the U.S. on the previous day, American forces captured the city of Manila from the Spanish in the Battle of Manila.[55][58]
This battle marked the end of Filipino-American collaboration, as the American action of preventing Filipino forces from entering the captured city of Manila was deeply resented by the Filipinos. This later led to the PhilippineAmerican War,[59] which would prove to be more deadly and costly than the SpanishAmerican War.
The U.S. had sent a force of some 11,000 ground troops to the Philippines.
Armed conflict broke out between U.S. forces and the Filipinos when U.S. troops began to take the place of the Spanish in control of the country after the end of the war, resulting in the PhilippineAmerican War. On August 14, 1899, the Schurman Commission recommended that the U.S. retain control of the Philippines, possibly granting independence in the future.[60]
It becomes more difficult for a nation to remain neutral in foreign affairs when said nation morphs to world empire status.
Power; in and of itself has a dynamic to feed.