On rivers, civilizations can transport . a. traders
c. kings
b. soldiers
d. all of the above

states

explanation:

as the old saying goes, all politics are local. state and federal governments affect our daily lives in numerous ways. yet, in our federal system, there is supposed to be a balance between federal and state power. as james madison envisioned it in federalist no. 51, “the power surrendered by the people” would be “divided between two distinct governments,” creating a balance of power that would enable the “different governments [to] control each other.”

i think it would be a

barack obama

44th president of the united states

declare war, appoint military officers, sign treaties, make alliances