The idea that Colombia and Mexico face similar drug wars has shaped US policy there for years. But differences - from geography to the state's ability to respond - call for a different approach.
Some say Mexico needs to learn from its experience in Michoacán by recognizing it has no reliable partners among state and local forces, who are often in cahoots with drug gangs.
Mexico's lower house unanimously voted to change a military code that gave the military courts jurisdiction over any crimes committed by on-duty soldiers.
Mexico received US approval for the purchase of 18 Black Hawk helicopters. Some analysts wonder if the planned purchase signals a longer-term, more militarized approach to fighting cartels.
The goal in releasing 100,000 acre-feet of water from a dam on the US-Mexico border is to reestablish the Colorado River's flow in Mexico and restore wetlands there.
Reactions in the region have ranged from name calling to accusations of Russian meddling to observations of declining world powers.
The business community in western Michoácan, Mexico, is trying to regain its footing after years of terror under the thumb of the Knights Templar criminal gang.
The vigilante movement has been hailed in Mexican towns where the Knights Templar cartel wrecked havoc, but it raises questions about extralegal policing.
One cartel king behind bars is reason to celebrate. But the outlook is complicated.
Joaquín Guzmán, head of the Sinaloa drug cartel, was arrested this weekend. His capture could unleash infighting within the cartel and turf wars with other groups.
To those watching for concrete results from the North American summit, an announcement about butterfly conservation may have been symbolic of a meeting that offered few tangible results.