Ow and why did the ideas of an American empire change from the 1790s to the 1850s? Did the definition of American Exceptionalismchange as well?

Assignment Prompt
How and why did the ideas of an American empire change from the 1790s to the 1850s? Did the definition of American Exceptionalismchange as well?

Overview
Details: 2-3 pages, double spaced, 12 pt type, 1 inch margins. Grammar, logic, and clarity count. Specific and detailed evidence required. Footnotes required.
use primary documents (you MUST utilize the Manifest Destiny book documents and you may chose to use other assigned documents or use Jones Created Equal ) in this assignment
consider change over time
utilize Rule of Three organization