What arguments were made in opposition to imperialism and the Spanish-American War?

The Spanish-American War on 1898 was caused by the Wilson-Gorman Tariff (1894) or the American tariff. It put hold on the exporting of sugar form Cube to United States and sugarhad a big impact on the Cuban economy at that time making American investors worry for their businesses as well. After the war, United States was able to make improvements on Cuba’s sytems. This gave US the opportunity to implement Platt Amendment, making countries like Cuba to be subtly colonies again,. This angered the colonized countries forming into rebellion against the US.