Why did some northerners oppose abolition

The northerners that opposed abolition made money from the southern cotton.

Explanation:

Typicially the northerners who opposed abolition were the ones that made money from slavery in the south - specifically cotton. This included mill owner, merchants and some bankers. They were more concerned with making (and keeping money) than with abolishing slavery.

the answer should be:

their party has more members.

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asked for and recieved from the united states