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The war in the Philippines was fairly unpopular in the US when it was taking place. For one thing, it seemed to drag on forever (compared to the brief Spanish-American War, which lasted a few months in 1898, the Philippine insurgency churned on from or fourteen more years until 1913). It was expensive. It led to thousands of American fatalities. And it produced a lot of very ugly incidents and massacres.
Actually, some of the opposition toward the US entering World War I came from people who cited the Philippine Insurgency. They were afraid of plunging the US into yet another nasty, endless conflict.