In that Act it was provided that "New States of convenient size, not exceeding four in number, in addition to the said State of Texas, and having sufficient population, may hereafter, by the consent of said State, be formed out of the territory thereof, which shall be entitled to admission under the provisions of the Federal Constitution; and such States as may be formed out of that portion of said territory lying south of thirty-six degrees thirty minutes north latitude, commonly known as the Missouri Compromise line, shall be admitted into the Union with or without Slavery, as the people of each State asking admission may desire. And in such State or States as shall be formed out of said territory north of said Missouri Compromise line, Slavery or involuntary servitude (except for crime) shall be prohibited." As has been lucidly stated by another,--[Greeley's History]--"while seeming to curtail and circumscribe Slavery north of the above parallel (that of 36 30' north latitude), this measure really extended it northward to that parallel, which it had not yet approached, under the flag of Texas, within hundreds of miles. But the chief end of this sham Compromise was the involving of Congress in an indirect indorsement of the claim of Texas to the entire left bank of the Rio Grande, from its mouth to its source; and this was effected." Texas quickly consented to the Act of annexation, and in December, 1845, a Joint Resolution formally admitting her as a State of the Union, reported by Stephen A. Douglas, was duly passed. In May, 1846, the American forces under General Taylor, which had been dispatched to protect Texas from threatened assault, were attacked by the Mexican army, which at Palo Alto was badly defeated and at Resaca de la Palma driven back across the Rio Grande. Congress immediately declared that by this invasion a state of War existed between Mexico and the United States. Thus commenced the War with Mexico--destined to end in the triumph of the American Army, and the acquisition of large areas of territory to the United States. In anticipation of such triumph, President Polk lost little time in asking an appropriation of over two million dollars by Congress to facilitate negotiations for peace with, and territorial cession from, Mexico. And a Bill making such appropriation was quickly passed by the House of Representatives--but with the following significant proviso attached, which had been offered by Mr. Wilmot: "Provided. That as an express and fundamental condition to the acquisition of any territory from the Republic of Mexico by the United States, by virtue of any treaty that may be negotiated between them, and to the use by the Executive of the moneys herein appropriated, neither Slavery nor involuntary servitude shall ever exist in any part of said territory, except for crime, whereof the party shall first be duly convicted."