United States Expansionism: 1790s- 1860s The major American aspiration during the 1790s through the 1860s was westward expansion. Americans looked to the western lands as an opportunity for large amounts of free land, for growth of industry, and manifest destiny. This hunger for more wealth and property, led Americans conquer lands that were rightfully someone else's. Manifest destiny and westward expansion brought many problematic issues to the Unites States verses the Indians that took the Americans to the Civil War. The first issue that a ....