Despite rising inventory, geopolitical tensions means the coast is still not clear for lower-priced gasoline this summer.
Martin Luther King Jr. cried when he visited Marks, Mississippi, in 1968. If he were alive today, "he may very well still be weeping," one official says.
"I need to hear his voice," says one mother. "There are many desperate mothers here."
The killings have particularly hit states like Michoacán, Guerrero and Oaxaca.
The mother and son were separated a month ago after crossing the border into Arizona after a long journey from Guatemala.