1846年5月——1848年2月的美国对墨西哥战争,是美国大陆扩张史和西进运动史上一次具有关键意义的战争。它既推动美国经济大国的形成和发展,又加剧北部工业资本和南部奴隶制的矛盾,成为美国内战的前驱。(一)“天定命运”的扩张主义理论19世纪40年代是美国大陆扩张和西进运动的高潮时期,扩张主义理论“天定命运”论是美 The U.S. war on Mexico from May 1846 to February 1848 was a crucial war in the history of the expansion of the continental United States and the history of the westward movement. It not only promoted the formation and development of the United States economic power, but also aggravated the contradiction between industrial capital in the north and slavery in the south and became a precursor to the U.S. civil war. (I) The Theory of Expansionism of “Destiny Destiny” The 1840s was the climax of the expansion and westward movement of the United States mainland. The theory of “destiny destiny” in the expansionist theory is the United States