Okay. Well, although there have been international invasions and government decapitations and imperial expansions such as you are advocating, which have happened repeatedly over the thousands of years humans have been around, there has never been an occasion where the strategy of "fixing" another country by invading it, ever actually worked.
And although more thorough enforcement of existing laws against employing illegals might help, you wont find any support for it (past lip service) from either of the largest American political parties. The Republicans used to oppose any attempt to require national identity documentation, and though they've reversed course on that over the years, they are still adamantly opposed to spending the amount of money needed to actually enforce even the existing laws against employing illegals. No one supported Trump's campaign proposal to expand INS or the justice system enough to deal with existing cases, and neither party has supported investigation and prosecution of employers.
If your goal is to make it less desirable to come to the US illegally, there are other options you could consider. Such as,put an end to allowing American companies to hire foreign workers at below living wages, even while they are still in their home countries; to prevent foreign companies from selling in the US market, if their national governments allow either slave labor, or oppression of the working classes.
You could also support the opposite of that, which has been proposed by a subset of the Republicans: reverse all American laws requiring safe working environments, end all anti-pollution controls, eliminate all worker rights entirely, and allow American companies to behave as badly and as corruptly as foreign companies do, so that the US wont be attractive any more.
But invasion and "repair" of foreign countries? It never works.
I guess you read some of what I wrote... I'm not advocating invading anything. Read it again.
I suggested that Canada and USA
HELP Mexico not invade Mexico.
Then, Canada, USA and Mexico
HELP Guatemala, then Canada, USA, Mexico and Guatemala
HELP Honduras and so on down the hemisphere until all the countries on the American Hemisphere are 1st world.
Why is that such a difficult concept to understand?
Earth has the technology and the resources yet the technology and resources are being withheld from global advancement by the stingy, "The Oppressors".
Sorry if I misinterpreted. I keyed in on the phrases "Go in and permanently remove the oppression," and "Yes, warmongers and cartels would die. Oppressive regimes would be toppled and a lot of people would have to be jailed or eliminated." That read like invasion to me. I sure don't know how to do those things without invading.
How exactly, mechanically, would the US and Canada accomplish this help, that's different from what we've been doing for decades?
Taking Mexico as an example...
The Mexican government already has a lethal action policy. Problem is, that lethal action is against its citizens not the oppressors.
I think any change towards a 1st world nation would first need to be advice. To educate not just the people in the streets and fields but the people in power that are willing to advance their nation. They will need to identify the people and conditions that are preventing them from attaining that 'better life'. Then, once the problems are identified assistance can be supplied for the actions they determine to reach that goal. If its done right, some of the oppressors will convert to a better way of thinking. Only the die hard oppressors would have to be eliminated.
Plus, they start eliminating oppressors, some will change their oppressive stance to avoid being killed. People, any people have the capacity to change if the motivation for change is done right.
Rewards and punishments are very effective, just look at religion.
Mechanically, begin with infrastructure (Highways, Bridges, High-speed Trains, Hospitals, Universities, Water Works, Electricty) Construct some cities, Erect residences, Build museums and parks, Clean up what is already there, Remodel.
Put the people to work earning money they are allowed to keep and use to make their lives better. Get the billionares to contribute to national advancement.
http://en.wikipedia.org/wiki/List_of_Mexicans_by_net_worth
That list of 35 people is only a list of the ones that officially claim their wealth. Think about the billions that go unclaimed held by cartel leaders. There's plenty of money available.