Answer :
The rapid settlement of the Old Northwest and Southwest resulted in the admission of Illinois, Alabama, Indiana, Mississippi states to the Union in close succession between 1816 and 1819.
- Trade with the United States was opened when Mexico won its independence from Spain in 1821 and New Mexico was made a territory of Mexico.
- The following year, American settlers started traveling the Santa Fe Trail to reach New Mexico.
- The Mexican-American War broke out in 1846, and U.S. General Stephen W.
- Land was easy to come by in the West while it was heavily populated in the East and South.
- Many white Americans left the East due to population expansion.
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