Answer:
The Republican Party
Explanation:
The Republican Party promised not to get between the states and slavery, but then refused to further expand slavery into the territories.
Number 18 would be "D".
Number 19 would be "A".
Number 20 would be "C".
Number 21 would be "C".
Number 22 would be "D".
Number 23 might be "C" I'm not sure, lol.
B. The new middle class had leisure time and extra money
The correct answer is "It's a primary source because it's firsthand information".
When we're presented with a statistical study of a certain topic, we're dealing with hard facts. A statement addressing "Percentage of College Degrees Awarded to Women" isn't making any assumptions on the matter and the tone of the phrase is neutral as opposed to personal (like you would find in a diary for example). Also, it's not an opinion that someone is giving through speech, but rather the expression of a mathematical calculation that someone made through the observation of certain data firsthand. That's why it is a primary source.
Hope this is helpful!