The metro area’s core six counties straddle the border between the states of Missouri (4 counties) and Kansas (2 counties).

Big military base and probably lots of border trade if that continues.

Also I am thinking now that these are small rural counties with population in the entire county probably no more than 50k or so.. at least with most of those folks living in the city of Oroville which is right on the border with British Columbia In my flying days I would go into Oroville to get through US customs compared to going into one of the airports Airports north of Seattle .

It does have some road running through a portion of it and it does have the railroad running along the border. 

The border on the South side of our property is the Belize river. 

In 1950 a law was passed that the City of Detroit could not expand its borders like other cities have done. 

Construction has already started, with the first building being completed in 2025.Sources:Foulger Pratt WestEndWestEndInova Alexandria HospitalFirst phase of Landmark Mall redevelopment approved in AlexandriaEisenhower / Carlyle Alexandria: 7.6 Million Square Foot Expansion of the Hoffman Town Center on the Horizon Hoffman Co, the current owners of the Hoffman Town Center on the border of the Carlyle District, have long owned six lots totaling 17 acres in the area that have been vacant to this day, and have long had plans in the works for a revolutionary vision for the Eisenhower East Neighborhood.

I am looking at areas in the border states.

Cross border taxation is very complicated, most developed countries like the US and Canada have sophisticated systems to ensure their residents pay taxes, and you are not likely to be able to achieve your goal of not paying Canadian taxes on Florida income while a Canadian resident. 

I seem to recall a prior post where you mentioned Grand as your southern border, so what's your western border?