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Answer:
Mississippi River
Explanation:
The capture of New Orleans was one of the most significant moments during the civil war because its was an important ports a center of marine architecture and building, the Mississippi River being an important river for marine operations, a region of the South was capture by General Butler and Admiral David Farragut of the North in 18 to 29th of April, 1862.
The Tyler and Polk administrations
Both administrations strongly supported American westward expansion.
John Tyler pressed for the annexation of Texas as a slave state during his administration (1841-45) and at the end of it, he signed a Texas annexation bill into law, which was admitted as a state in the first year of Polk's presidency.
James K. Polk, who ruled from 1845 to 1849, also supported American expansion to the point he led the U.S. into the Mexican-American War (1846-48) in which the U.S. gained what is today California and much of the present-day Southwest.