Which area of the country was the most densely populated in 1853

New York

Explanation:

In the 1829s, New York became the center of Northern abolitionist activism. In 1863, during the American Civil War, New York experienced a civil uprising with very violent demonstrations against forced enlistment, known as the "draft week" days. After that, immigration and development transformed the city, and in 1835 New York became the largest and most populous city in the United States.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)