How did the four river valley civilizations differ? ( give me like 3 or 4 reasons) : )

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.

the structure was most likely used for;

c. playing a ball game with stone hoops

either d or b, i'm not to sure. but my gut tells me it's prob going to be b

the u.s. lent military supplies in exchange for bases.