Modern-day Mexico still deals with political instability. What recent but related problem does it face?

foreign occupation

rapid population decline

war with nearby nations

drug organizations

Modern-day Mexico still deals with political instability and related problems like drug organizations.

Explanation:

Mexican drug cartels have existed for a few decades, but became more powerful after the leading Colombian cartels, the Medellin cartel and the Cali cartel, dissolved and dropped in importance. Today, Mexican drug cartels dominate the drug market in the United States. Violence has escalated following the arrest of several key figures within the cartels as the cartels fight for control of entry routes to the United States.

Mexico is at the top in the production and transportation of drugs worldwide, and it is from here that the majority of all cannabis and large parts of all methamphetamine are imported into the United States. Although Mexico accounts for a relatively small proportion of world heroin production, the country accounts for a large proportion of all heroin distributed in the United States. Mexican drug cartels control an estimated 70% of all foreign drugs imported into the United States.

Answer: Drug Organizations and cartels.