Examlex
Permanently frozen subsoil characteristic of the tundra is termed _________.
Pike's Journey
An expedition led by American explorer Zebulon Pike in the early 19th century, known for its exploration of the southwestern part of the Louisiana Territory and encounters with Spanish forces.
Louisiana Territory
A vast area of land acquired by the United States from France in 1803, doubling the size of the nation and driving westward expansion.
Western Expansion
The period of territorial growth and settler migration in the United States during the 19th century, leading to the acquisition and settlement of lands west of the Mississippi River.
John Astor
An American businessman who made his fortune in fur trading and real estate, becoming one of the wealthiest individuals in early 19th century America.
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