The expansionist movement produced a theory of "Manifest Destiny." This phrase first appeared in an article written by a Democratic politician John L. O'Sullivan. The major implications of "Manifest Destiny" are that the founding of the US is inevitable, that the expansion of American territory is legitimate, and that the spread of American democracy is the task of American people who were chosen to do the Lord's work.
扩张主义运动产生了“天定命运论”。这个短语最早出现在民主党政治家约翰·L·奥沙利文(John L. O’sullivan)的一篇文章中。“天定命运论”的主要含义是，美国的建立是不可避免的，美国领土的扩张是合法的，美国民主的传播是美国人民的任务，他们被选中来做上帝的工作。
