In a speech before the Senate in 1899, Beveridge said, "The march of the people of the United States is westward, and we will not be stopped. We will occupy other territories, we will build other ships, we will make other wars, and we will extend the area of American freedom all around the globe." He also said that America had a duty to "lift up the submerged races of the world" and that "we must go out and plant our civilization in less favored lands."
Beveridge's views were shaped by the ideology of Manifest Destiny, the idea that the United States had a responsibility to expand westward. Manifest Destiny was a popular belief in the mid-19th century and it was used to justify the acquisition of new territories, such as the Louisiana Territory and the Mexican Cession.
Beveridge's speech was controversial, but it was also popular with many Americans who shared his views. His speech is considered to be a classic statement of American expansionism.