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After victory the [[Mexican American War]] of 1846-48, the U.S. purchased via the [[Treaty of Guadalupe Hidalgo]] territory that became the states of [[California]], [[Nevada]], [[Utah]], [[Colorado]], [[New Mexico]] and [[Arizona]].  In 1846 the U.S. and Britain agreed that the 49th Parallel (degree of latitude) would serve as the boundary between the U. S. and [[British Columbia]] (now part of Canada). The American portion became the states of [[Washington]], [[Oregon]] and [[Idaho]].

After victory the [[Mexican American War]] of 1846-48, the U.S. purchased via the [[Treaty of Guadalupe Hidalgo]] territory that became the states of [[California]], [[Nevada]], [[Utah]], [[Colorado]], [[New Mexico]] and [[Arizona]].  In 1846 the U.S. and Britain agreed that the 49th Parallel (degree of latitude) would serve as the boundary between the U. S. and [[British Columbia]] (now part of Canada). The American portion became the states of [[Washington]], [[Oregon]] and [[Idaho]].

In 1867, the U.S. purchased [[Alaska]] from [[Russia]]. It became a state in 1960.

In 1867, the U.S. purchased [[Alaska]] from [[Russia]]. It became a state in 1959.

Hawaii became an independent republic in 1894 and voluntarily joined the U.S. in 1898, becoming a state in 1960.  

Hawaii became an independent republic in 1894 and voluntarily joined the U.S. in 1898, becoming a state in 1960.