This is true. Not every American was in agreement with the war and the expansionist strategy.
The war in this question was the Mexican-American war. The democrats that were mostly living in the southwest were in agreement with the war. They supported it.
But the people that were in opposition to the war were the Whigs. These people condemned the war and also discouraged the land-grabbing ideas of the US. The regarded the war as a conscienceless effort by the United State.
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