To raise revenue from the colonies to pay for their defense
Explanation:
It had many causes, but there were two main issues that split the nation: first was the issue of slavery, and second was the balance of power in the federal government. ... Without slaves, the South believed that their region's economy would be destroyed.
Slaves were sold which means money was traded and you need money to successfully thrive and so when it ended there was no more money so they had to find different ways and it took a while.