Which new transportation technology made a huge difference in how the North
conducted war strategy?

Railroads

Explanation:

Railroads allowed for transportation of supplies to soldiers, such as food and med supplies. This also became a strategic way to quietly move soldiers from one place to another quickly.

question 10: the answer is c, to their constituents address a problem.

question 11: i think it would be domestic bills, which deal with american issues only and public bills, which affect the whole nation.