In the 1980s, the us worked with neighboring countries to end the drug trafficking out of ; by the 2000s, the fight had moved to
a.
colombia . . mexico
b.
mexico . . canada
c.
canada . . guatemala
d.
guatemala . . colombia

The answer is letter a.  Columbia and Mexico.  In the past, Colombia dominated the drug trade but due to crackdowns made the United States and local authorities much progress was made against the cartels in Colombia that culminated with the killing of Pablo Escobar.  Later drug cartels emerged in Mexico who started out as transporters but later became traffickers themselves and are the new threat in the war on drugs.

answer; for good luck

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