A. Cotton gin
The South was based on agriculture, which means lots of cotton was produced. The cotton gin is a machine which made this much easier.
"<span>Jackson refused to support laws that would set up a national bank" is the best option here. Jackson was famously opposed to the creation of a national bank. </span>
I think the answer is the first one
The Union General Meade did nothing except hold his own ground without trying to attack the Confederate army.
