Final answer:
Mexican drug cartels affect the United States through illegal drug trafficking, violence, crime, corruption, and economic influence.
Step-by-step explanation:
Mexican drug cartels have a significant impact on the United States through their involvement in illegal drug trafficking. They are major controllers of drugs entering the U.S., and their operations have led to increased violence, crime, and corruption. Some of the effects include the smuggling of drugs across the border, the infiltration of government and law enforcement agencies, and the rise in drug-related homicides. The cartels also contribute to the economy in certain areas of Mexico through drug income.