Spot Resolutions

Eight resolutions sought specific information. The first: "whether the spot on which the blood of our citizens was shed, as in his messages declared, was or was not within the territory of Spain, at least after the treaty of 1819, until the Mexican revolution." The second: "whether that spot is or is not within the territory which was wrested from Spain by the revolutionary Government of Mexico." The other six resolutions extended the analysis to determine whether the territory on which the casualties occurred was ever under the government or laws of Texas or of the United States. The House of Representatives never acted on Lincoln's resolutions, but they demonstrated the Whig reluctance to accept President Polk's grounds to begin the war.

According to Lincoln biographer David Herbert Donald, "nobody paid much attention to his resolutions, which the House neither debated nor adopted". Many Democrats regarded the resolutions as unpatriotic; some Whigs cautioned that criticism of the war would hurt the Whigs politically. Lincoln, however, was not speaking out against the war itself, but rather against Polk's conduct of it. In fact, the Whigs would later nominate Zachary Taylor (a hero of the war) as their candidate, whom Lincoln supported.

The location where the initial bloodshed (known as the Thornton Affair) occurred in April 1846 is located in present-day Cameron County, Texas, just north of the Rio Grande which represented the American claim for Texas's boundary with Mexico (as well as the current international border). The Mexican claim set the boundary at the Nueces River, considerably further north.