Which group of invaders brought china's song dynasty to an end?

the arabs

the japanese

the mongols

the turks

they were the direct result of some cultural difussion.

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.