Sometimes I like to imagine what the US would look like if we took a fraction of the trillions of dollars we wasted in Iraq and Afghanistan and used them to help our southern neighbors develop and modernize. Happy and content people don't risk their lives to cross the jungle.
It's a bit late for that these days, what with all the climate change and all that. Migration (in likely huge numbers) is coming and likely already largely underway around the world. There's gonna be more and more places humans simply cannot physically survive anymore and that alone will drive people to move elsewhere. This of course will likely lead to violence, because that's what far too many humans do when other humans try to "muscle in on their territory". It's a sad fact that unless most of the human race grows up and starts acting like adults for a change, we're likely in for war pretty much everywhere soon enough.