杰斐逊是美国历史上一位伟大的总统,同时也是一位有名的扩张主义者,被认为是“天定命运”的首要阐释者,他入主白宫后不久就表示:“尽管我们目前的利益会把我们限制在我们的疆域内,但不可能不展望未来,那时,我们的迅速发展会把我们的利益扩大到这个疆域之外,我们将占领整个北美大陆,即使不是南美的话。”其在任时,美国向外扩张的一个最重要的事件便是从法国手中购买路易斯安那。 Jefferson, a great president in the history of the United States and also a prominent expansionist who was considered the chief interpreter of “destiny”, said shortly after entering the White House: “Although our current interests will be Limit us to our territory, but it is impossible not to look to the future, when our rapid growth will extend our interests beyond this territory and we will occupy the entire North American continent, if not South America. ” When the United States one of the most important event of outward expansion is the purchase of Louisiana from France.