I want to highlight "who" is crossing the borders. There is a misconception that these people are "South American", whilst some may be the vast majority are indigenous people AKA native american. Some can speak Spanish some cannot, they speak their own tongue.
All their journeys have different beginnings but one main through line is the continual erasure of their lands. Either through industry (oil, soy production, minerals etc), infrastructure set up or drug trade.
It is important to know more individual stories and the root cause of this problem. It is not an immigration policy problem, it is a migration crisis. Two distinct problems.
This picture is of a Waorani child, whose land is being erased due to oil, if he's lucky, his family will move to another part of the Amazon but if not he will be forced into the city. Where his family will not be able to find work due to lack of western skill sets and language barrier. Forcing them into poverty and violence - two main catalysts for migration since the dawn of time.
Photo Credit: National Geographic