What did thomas "stonewall" jackson do to gain his nickname and become a noted civil war figure? a. he marched the confederate army up to pennsylvania to invade the north. b. he refused to give up his position at the battle of bull run. c. he led the union's fifth attempt at capturing the confederate capital. d. he led the famous "march to the sea" through georgia.

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.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.