Sorry but that's all just crackpot conspiracy theory garbage.
Mexico and the US aren't even kingdoms. Canada is.
Canada's a democratic constitutional monarchy by the democratic choice of Canadians.
That's been the preferred system of governance since the French founded Canada 480 years ago.
Canadians won't throw away nearly 500 years of staunch monarchism.
There's simply no way a North American Union is possible with such radically different political systems.
There's also Canada's Constitution to consider. By law, anything that changes Canada's monarchy requires constitutional amendment. By law, amendments require the unanimous consent of both houses of Canada's Federal Parliament AND the governments of all 10 Canadian Provinces.
That, in turn, requires the consent of the majority of Canada's electorate. And the majority of Canadians don't want to be anything else with anyone else. If they did, they'd immigrate elsewhere like normal people.
There's also the matter of rights. Canada has more Constitutional and other legal rights and freedoms than the USA and Mexican Constitutions grant to US and Mexican citizens.
Some, like the globally accepted right to healthcare, the US stands alone in refusing to grant its people.
Which is another reason why a North American Union is impossible nonsense:
Canadians won't stand to have their rights reduced to US levels. The US won't increase its own to Canadian standards. And nobody in either nation gives a sh*t what the Mexicans think.
And what about language rights? Canada has two official languages, Mexico has one, and the US has none. (The US Government has never passed any official language legislation.)
The US is falling apart economically, politically and societally. It also has the highest national debt of any country in the history of the human race. And the rest of the International Community considers the US to be so out of control that the US was named the greatest threat to world peace.
Mexico, meanwhile, is embroiled in a civil war between drug cartels and the Mexican government.
While the Mexican government's made some progress, there's no clear victory in sight anytime soon.
Canada is nothing like that:
'Canada: Richer than America and more economically powerful than Europe'
'The most prosperous nation in the Americas, Canada ranks first in personal freedom'
'U.S. falls out of top 10 most prosperous nations, Canada remains number six'
'Canadians getting richer, average net worth tops $400,000'
'Canada first and only G7 country to recover all jobs lost during recession'
'Canada to lead G7 nations in average growth for next 50 years: OECD'
'Canada Trounces U.S. In Best Countries For Business'
'Canada leads North America in economic freedom'
'Canada rises to Top Five in world economic freedom ranking as U.S. plummets to 18th'
'Canadian banks rated safest in world'
'Canada: Constitutional Superpower'
'Charter of Rights turns Canada into a 'constitutional' trendsetter'
'Canada remains world's most educated country'
'Canada is best G20 country for females, India worst'
'Best Country For Kids: Canada Best Place In The World To Raise Children'
'Your Kids Will Have A Better Life If You Move To Canada'
'Canada again named the country with the world's best reputation'
'Canada's natural beauty, multicultural society, health care service and security made it the top place on the planet'
'And the fastest-growing G8 country is Canada'
'Free trade with Canada has become a global aspiration'
'Canada Leads the Pack in Diversifying its Export Markets'
'Canada leads the world in research impact, shows study'
'Canada leads the world in technology adoption'
'Canada ranks among the top 10 least corrupt countries in the world'
'Canada ranked second-happiest nation on the planet'
'Canada rises to 4th in world peace rankings'
'Vancouver, Toronto and Calgary picked as three of world's top five most liveable cities'
'Jerusalem Post Calls Canada The New Leader Of The Free World'
'Canadian Prime Minister named World Statesman of the Year'
'Canadian PM more powerful than a president, U.S. envoy says'
'Canada can fairly claim to be the best-governed country in the world'
'Why Thousands Of Brits Move To Canada Every Year'
'Why being poor in Canada is better than being rich in France'
'Look out, Americans, average Canadian is richer than you are'
'Study: Canadians Live Longer, Healthier Lives Than Yanks'
'Canadians pay less tax per person than Americans'
'Americans enjoy less economic mobility than their peers in Canada'
'The American Dream is alive and well - in Canada'
'Americans are the latest economic refugees, and they're heading to Canada'
'Americans moving to Canada in record numbers: report'
There's absolutely no benefit to Canada or Canadians to have closer ties with the US or Mexico.
Which is why any talk of North American Unions is an absolute waste of time. Go find a new hobby.