On the Rio Grande events progressed rapidly. Before his dispatch reached Washington, on May 8, General Taylor with his small force defeated the Mexicans at Palo Alto, and on the 9th he won a still more important success at Resaca de la Palma. On the 18th he crossed the Rio Grande and occupied Matamoras. General Kearney was ordered to conquer New Mexico, which he did without firing a gun. He was to push forward to California. But there his services were not needed. Captain Fremont, engaged in an exploring expedition, with the aid of his companions and of American settlers, and with the coöperation of American men-of-war on the Pacific coast, set up a provisional government in California, and brought the country under the control of the United States.
During the summer of 1846 there was a pause in the war and an “intrigue for peace.” The administration had put itself in communication with Santa Anna, who, banished from Mexico, lived at the Havana. He created the impression that, if returned to power in his country, he would favor peace. The blockading squadron of the United States off Vera Cruz was instructed to let him pass into Mexico, which it did on August 8. President Polk asked of Congress an appropriation of $2,000,000 for purposes of negotiation, the intended result of which was understood to consist in territorial cessions by Mexico to the United States. Then something happened which marked the beginning of the final struggle about slavery
