# data[].attributes.body
Source:Britannica
Manifest Destiny was Important to the Western Expansion because manifest destiny is the idea that the United States should continue expanding  westward to the Pacific and beyond,so any people went west because of this idea.

# data[].attributes.body
Source :Britannica
Date:1821-1880
The Santa Fe Trail was important to the western expansion because it provided a safeland land route to move people westward.

# data[].attributes.body
Source :World Book
Date : 1848
The Mexican Cession of 1848 was important to the Western Expansion because it was a large piece of land that Mexico turned over to the U.S following the Mexican -American War .

# data[].attributes.body
Source:Britannica
Date:1829
The Steam Locomotive was important to the Western Expansion because it provided a safer,faster and a more efficent way to move people westward.The Steam Locomotive prevented many deaths and because of that more people could move westward which was important to the western expansion.

# data[].attributes.body
Source:Britannica
Date :1848-1852
The California Gold Rush was important to the Western Expansion because many people decided to move westward in hopes of finding gold because of the gold rush which helped the western expansion .

# data[].attributes.body
Source:World Book
Date :July 4,1776
The Declaration of Independence was very important to the Western Expansion because it declared that the 13 colonies were independent from Great Britian and formed the United States Of America, and because we declared our independence the U.S.A could control their own destiny and settle west past the Proclamation line.

# data[].attributes.body
Source : Britannica
Date:1846-1848
The Mexican- American War was important to the western expansion because that war gained a very large amount of land extending westward from the Rio Grande River and because of that land Americans can settle and continue expanding westward.

# data[].attributes.body
Source :Britannica
Date:1785-1819
Oliver Hazard Perry was important to the western expansion because of his success in the war of 1812 in the battle of Lake Erie,which helped ensure U.S control of the west that contributed to people being able to move west.

# data[].attributes.body
Source:World Book
Date:June 30,1854
The Gadsden Purchase was important to the Western Expansion because the land purchased made it possible for more people to settle westward.

# data[].attributes.body
Source:World Book
Date:December 20,1803
The Louisiana Purchase was important to the Western Expansion because the land that the U.S.A owned expanded westward and because of that more people could move westward  to  settle,trade,farm,mine ,etc.