From which country did the United States buy Alaska?

Which French leader sold the Louisiana Purchase to Thomas Jefferson?

Who was the 1840s president who brought large amounts of territory such as Oregon and Texas into the United States?

As the United States acquired more land between 1803 and 1850, controversies that arose in these territories focused on which issue?

Which of these is known for starting the United States continental expansion?

"Fifty-Four Forty or Fight!" was a slogan of the 1840's referring to the wish of American expansionists to annex which shared region?

This 1872 painting by John Gast is a metaphor for what widely disseminated belief in 19th-century America?

Frederick Jackson Turner's "Frontier Thesis" was used to promote the attempted colonization of what overseas, Asian territory?