This isn’t the first caravan. CNN states this is the 5th year.
“...the caravan comprised mostly of Hondurans was organized roughly a month ago by the mysterious group Pueblo Sin Fronteras (People Without Borders)...”
https://www.cnn.com/2018/04/01/politics/trump-mexico-caravan-tweet/index.html
The organizers are Terrorists. Hunt them down and sanction accordingly.