Northerners in general and Republicans in particular. The reason was the Mexican-American War was motivated by pro-slave interests; they deemed the war as an increase in slave territory, which would upset the balance of power between pro and anti slave states. They were right, because at the end, this conflict indirectly led to the American Civil War (1861-1865).
The Whigs.
People were opposed to the annexation of Texas because it would be admitted to the union as a slave state.
He opposed it because it would expand slavery.Opposition to the Mexican-American War was mostly among abolitionists, who felt that the war was being fought to expand the area under which slavery could be legal and that the war had no legitimate cause. Notable among those who opposed the war were Abraham Lincoln, who in his only senate term sponsored resolutions asking whether the Mexicans fired on US soldiers on their soil or on US soil (or in the region disputed between Mexico and the US at the time), and Stephen Douglas who called the war the "rape of Mexico."
Opposition to the Mexican-American War was mostly among abolitionists, who felt that the war was being fought to expand the area under which slavery could be legal and that the war had no legitimate cause. Notable among those who opposed the war were Abraham Lincoln, who in his only senate term sponsored resolutions asking whether the Mexicans fired on US soldiers on their soil or on US soil (or in the region disputed between Mexico and the US at the time), and Stephen Douglas who called the war the "rape of Mexico."
anti-federalists opposed the constitution
Northern abolitionists opposed the Mexican American War.
The Whigs.
Yes, Lincoln was against the War with Mexico.
People were opposed to the annexation of Texas because it would be admitted to the union as a slave state.
because they thought it would be easier to defeat them so the war could end quickly
Socialists
abolitionists
Democrats
United States, Ecuador, MEXICO, Guatemala, Honduras
The Industrial Workers of the World
reservationists
The fear that slavery would spread into new territories