Serious question, why do you think Soros is paying people to march to America from Central America?
Because there have been articles outlining the backing of his organizations to start this movement & march. Originally it started as a protest against the conditions in their own country -- being so bad they were going to march out of it. The intent at that point was to draw attention to crime, poverty and corruption within their own nation. Then this grew into a march to protest the Trump administration policies.
There are multiple articles on the background of all of this including on CNN, etc of reporters embedded in with the marchers. Go read up - some interesting stories.