Author: David Agren, Special to USA TODAY

The caravan stretched for miles as migrants ambled along the Coastal Highway in southern Mexico still more than 1,000 miles from U.S. border

Here’s what you need to know about the migrant caravan, from who is making the journey to why they’re going north.

Central American migrants keep moving through Mexico, part of a controversial caravan that President Donald Trump has pounced on as an election issue

In southern Mexico, families of Central American migrants tugged suitcases and pushed baby strollers as they made their way northward to US border.