Question

complete the text.
in the decades following the louisiana purchase, the united states continued to add land all the way to the pacific coast and beyond. historians often call this period the era of ______.
options:
isolation
expansion
reconstruction
education

Explanation:

The text describes the U.S. acquiring territory west to the Pacific after the Louisiana Purchase. This process of territorial growth is referred to as an era of expansion. Isolation refers to avoiding foreign involvement, Reconstruction was the period after the Civil War, and education is unrelated to territorial acquisition.

Answer:

expansion