I hope you're right. 

But I wasn't thinking so much troops rolling across the border as a political integration. No need for armies when you can take over a country with the stroke of a pen. 

Trump is a hardline negotiator who isn't afraid to use whatever leverage he has at his disposal. What makes a CanUSA FTA so hard to negotiate is the unbiquitous integration of our supply chains. Not much room to maneuver. So why have a border at all?

The idea has been floated before and to a certain extent is already partially realized. Security between the Can US border is a lot less intensive than it is at any other border control point. 

The idea of us adopting the US dollar has been floated at least once in the past 15 years. 

So far we've been stubborn about our sovereignty but if Trump starts threatening us with harsher economy-hindering border security and heavy tariffs on our exports to the US he just might get the leverage he needs. 

Sorry if my first post sounded like invasion.