There are top La Raza people employed by The Obama Regime and many others who have direct pipelines into it
These La Raza types have been spreading the word (open borders) in Guatemala, Honduras El Salvador etc.... (my opinion but this is common sense!)
This isn’t just something that came about by word of mouth, this had to be coordinated with the different govts., mainly Mexico to allow them to come through Mexico without being stopped and sent back.
This appears to have been coordinated through Hillary’s State Department, no other govt agency could do it. It has to be official US govt. policy, not just some rogue agent or agency.
Just to coordinate it with the several govts involved probably took at least a year of negotiations.
Once the plan was worked out with the different govts. then they could start implementing the plan, but again they needed time to get the people together to implement the plan.
Once they got the influx started with preplanned groups and there was no response from the US govt., then word of mouth could take over.