Complete the paragraph about the reason for westward expansion in the United States during the nineteenth century.

The US government supported westward expansion. It envisioned a nation that covered a vast expanse of land from the East Coast to the Ocean. The acquisition of Texas, the Oregon Territory, and the ___ between 1845 and 1853 helped make this vision a reality. Most of this expansion happened during the presidential term of .

1st blank
A. Indian
B. Pacific
C. Atlantic

2nd blank
A. East
B. Southwest
C. Northwest

3rd Blank
A. Sam Houston
B. James Polk
C. Stephan Austin