While the economy in the south was based largely on agriculture, the economy in the north was based largely on
1. abolition.
2. farming.
3. slavery.
4. industry.

4. Industry.

Explanation:

Industrialization in the North began in the early 1800s, and continued up to the Civil War, and after.

The North was more populated than the South, which was mostly agrarian and rural, and had most of the big cities of the country at the time.

Finally, in the North slavery was illegal, and immigration from Europe became abundant and supplied the industrial cities with labor.

because mexico wanted to choose a centralized location