What was the commercial revolution?

a. a trade war between european countries following the colonization of the new world
b. the decrease in global trade between europe, the americas, and africa
c. an enormous change in the rules of commerce due to the columbian exchange
d. the replacement of colonialism with mercantilism

Your answer would be:

an enormous change in the rules of commerce due to the Columbian Exchange .

churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.