Final answer:
Westward expansion in the U.S. brought the contentious topic of slavery to the forefront, sparking conflicts and tensions between different regions.
Explanation:
Westward expansion in the United States forced the country to confront the controversial issue of slavery. As the nation expanded westward, debates arose over whether slavery should be allowed to spread into new territories, leading to significant tensions between the North and South. This issue ultimately played a pivotal role in the lead-up to the Civil War.
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