A few days later the representatives of the so-called A B C powers, Argentina, Brazil, and Chile, tendered their good offices for a peaceful settlement of the conflict and President Wilson promptly accepted their mediation. The resulting conference at Niagara, May 20, was not successful in its immediate object, but it resulted in the elimination of Huerta who resigned July 15, 1914. On August 20, General Venustiano Carranza, head of one of the revolutionary factions, assumed control of affairs at the capital, but his authority was disputed by General Francisco Villa, another insurrectionary chief. On Carranza's promise to respect the lives and property of American citizens the United States forces were withdrawn from Vera Cruz in November, 1914. In August, 1915, at the request of President Wilson the six ranking representatives of Latin America at Washington made an unsuccessful effort to reconcile the contending factions of Mexico. On their advice, however, President Wilson decided in October to recognize the government of Carranza, who now controlled three-fourths of the territory of Mexico. As a result of this action Villa began a series of attacks on American citizens and raids across the border, which in March, 1916, compelled the President to send a punitive expedition into Mexico and later to dispatch most of the regular army and large bodies of militia to the border.[284] The raids of Villa created a very awkward situation. Carranza not only made no real effort to suppress Villa, but he vigorously opposed the steps taken by the United States to protect its own citizens along the border, and even assumed a threatening attitude. There was a loud and persistent demand in the United States for war against Mexico. American investments in land, mines, rubber plantations, and other enterprises were very large, and these financial interests were particularly outraged at the President's policy of "watchful waiting." The President remained deaf to this clamor. No country had been so shamelessly exploited by foreign capital as Mexico. Furthermore it was suspected and very generally believed that the recent revolutions had been financed by American capital. President Wilson was determined to give the Mexican people an opportunity to reorganize their national life on a better basis and to lend them every assistance in the task. War with Mexico would have been a very serious undertaking and even a successful war would have meant the military occupation of Mexico for an indefinite period. President Wilson's refusal to become involved in war with Mexico convinced the world of his sincerity and gave him a hearing during the Great War such as no political leader of any nation ever before commanded.