Why were the Americans attracted to the New Mexico Territory around 1821?

They believed that Americans had the right and the duty to spread their culture across the continent all the way to the Pacific Ocean. This belief is called the manifest destiny.

Explanation:

Santa Fe was a great area for trading, southerners liked it for cotton plantations.

d is the best answer for this question.

was a long, primarily nonviolent series of events to bring full civil rights and equality under the law to all americans. the era has had a lasting impact on united states society, in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism. in the south violence and fraud in southern elections from 1868 to 1876, which had reduced black voter turnout and enabled southern white democrats to regain power in state legislatures across the south