What was the impact of Spain’s silver trade with Asia?

The impact of Spain's silver trade with Asia was that "It declined the price of silver." This is evident in the fact that Spain's silver trade with Asia led the government of China to start using this silver to mine their own currency, given the fact that they were the biggest buyer of the silver from Spain.    

a.

congress passed laws allowing for free passage between states.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.