Colonial America looks west (1754-1795)
The United States extends its empire (1796-1811)
Crisis on the frontier (1812-1820)
An expanding nation (1821-1845)
A transcontinental republic (1846-1853)
Wealth of the west (1854-1860)
Reshaping the west (1861-1867)
Frontier's end (1868-1900s)
The real significance of the fronitier.
