 The Good Neighbor Policy led to the Douglas-Weichers Agreement in June 1941 that secured Mexican oil only for the United States, and the Global Settlement in November 1941 that ended oil company demands on generous terms for the Mexicans, an example of the U.S. putting national security concerns over the interests of U.S. oil companies.When it became clear in other parts of Latin America that the U.S. and Mexico had substantially resolved their differences, the other Latin American countries were more amenable to support the U.S. and Allied effort against the Axis.Following losses of oil ships in the Gulf (the "Potrero del Llano" and "Faja de Oro") to German submarines ("U-564" and "U-106" respectively) the Mexican government declared war on the Axis powers on May 30, 1942.