To assist free black people in emigrating to Africa.
Answer:
Trade by barter
Explanation:
This economic system is known as the oldest economic system used by humans many years before money was first printed.
In this system, individuals traded their goods for another good that they wanted. It was not uncommon to see people trade copper for wheat or to trade a donkey for a dove.
This system made people to give out what they had (which they usually had in excess) for what they wanted.
The Battle of San Jacinto, fought on April 21, 1836, in present-day Harris County, Texas, was the decisive battle of the Texas Revolution. Led by General Sam Houston, the Texian Army engaged and defeated General Antonio López de Santa Anna's Mexican army in a fight that lasted just 18 minutes.
If you're talking about the time when the North was more urbanized than the South, some factors are industrialization (more jobs) and less hostility faced in the North.