Expansion in the United States
M.6.2.1
Manifest Destiny
Their belief was that it was God's will to expand west and that is what this picture is showing, Americans expanding and exploring the unknown.
War For texas independance
After texas had gained independence from Spain, it became its own little country for nine years before it was annexed into the U.S. and so their lone star is shown big and proud on the flag.
Mexican War
This is the battle of Buena Vista which the Mexicans were forced to withdraw from which left the victory to the Americans.