1. But many arrive with an adult---it looks like a parent.
2. Minors with a parent: Process these minors first.
3. Minors with a parent---most single parents seem to be female---should be sent immediately after processing back to El Salvador, Honduras, Guatemala, and other countries.
4. Mexico: It is also at fault. How could all those minors take the long trip across Mexico without Mexican authorities following them and watching them?
5. My answer: As long as Mexico is assured that they won't stop in Mexico, Mexico leaves them alone and let's them pass.
Mexico has a tight grip on their southern border. Who convinced them to let these immigrants come through in such large numbers?