Obviously, it is important to know the meaning of and the history behind Manifest Destiny. The United States used Manifest Destiny as the purpose for the Louisiana Purchase, the Indian Removal Act, and the annexation of Texas. Manifest Destiny essentially became the political power to grow the country geographically. It is understood that the reasons for Manifest Destiny and territorial expansion throughout the 1800s came from the need to spread Christianity and democracy.
There are several major examples of how America used Manifest Destiny to grow the country geographically. The Louisiana Purchase essentially doubled the size of America and allowed for westward expansion. The idea behind this was to expand the size of the American republic. Another key religious example can be taken from Andrew Jackson and the Indian Removal Act. Jackson felt as if he was the "Father" of the Native American people and it was his responsibility to convert them to Christianity. The result was the removal of thousands of Native Americans and geographic expansion for the United States.
The next example was the annexation of Texas. However, it is important to note that this expansion had the ulterior motive of increased slavery. During the first half of the 1800s, slavery became a major problem in the country. The South, therefore, favored Texas statehood and the expansion of slavery. Once again, this was done under the idea of Manifest Destiny.