what was the underlying source of international tension

A. the inflation of goods
B. a sharp decrease in population
C. whether newly added territories should allow slavery
D. disagreement over whether the economy of new territories be based on farming or factories

"What was an underlying source of tension in westward expansion during the 1850s?" That's the question.

When? Where?

in westward expansion during th 1850's ... sorry and is the answer D

I don't think any of those answers apply to international tension in America in the 1850s.

Well if you had to pick which one would it be

Do you know what international means? Are you sure that's the right word in your question?

The underlying source of international tension is option C: whether newly added territories should allow slavery. To determine this, you can analyze historical events and knowledge about this period of time.

First, you need to understand the context of the time period. In the mid-19th century, the United States was expanding its territory through the acquisition of new lands, such as Texas, California, and parts of the Mexican Cession. These acquisitions brought about debates and conflicts between the Northern and Southern states regarding the issue of slavery.

Next, you need to consider the positions of the two main factions involved. The Northern states, influenced by the growing abolitionist movement, were generally against the expansion of slavery into new territories. They believed in the moral imperative to end slavery and saw it as incompatible with their vision of a free society. On the other hand, the Southern states relied heavily on slave labor for their agrarian economy and insisted on the right to expand slavery into new territories.

These conflicting viewpoints caused increasing tension between the Northern and Southern states, as well as between the United States and other countries, including the United Kingdom. The United Kingdom, having abolished slavery in its colonies, placed moral pressure on the United States to follow suit. These tensions ultimately played a significant role in the lead-up to the American Civil War.

In conclusion, the issue of whether newly added territories should allow slavery was the underlying source of international tension during this period. Analyzing historical events and understanding the perspectives of the parties involved helps to shed light on this answer.