Which was a major challenge in Mexico in the early twenty-first century? A . political unrest and civil war B. ongoing violence caused by Mexico's drug cartels C. the threat of a communist takeover. D. constant guerrilla warfare from neighboring countries

B ongoing violence caused by Mexico's drug cartels

Explanation: Violence continues to rage in Mexico more than a decade after former President Felipe Calderon launched a crackdown on drug cartels.

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b. ongoing violence caused by Mexico's drug cartels

Explanation: jus took da quiz

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.