What Improvements in weaponry made the civil war battle tactics mentioned obsolete, or out of date?

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

honeslty bro its the same thing

answer by mimiwhatsup: c. british impressment involved attacking and boarding neutral merchant ships and forcing the captured crew to serve in the royal navy.

source: "british impressment, or practice of taking or seizing american sailors from american trading ships and forcing them into the british navy." ()

a.) it weakened the power of the catholic church in europe.