Plausible size of British North America in XX century.

If American of British Empire indipendence never happened,and original 13 colonies remained in the Empire,which could be the plausible size (and borders) of British North America in early-mid XX century?
OTL Canada,more the 13 colonies...more ?
 
If American of British Empire independence never happened, and the original 13 Colonies remained in the Empire, what could be the plausible size (and borders) of British North America in early-mid XX century?
At the very least you're going to see everything that makes up the USA and Canada plus Alaska to complete things. The same forces and impulses that saw a westwards expansion are still going to be there under the British. Mexico is also a possibility if Britain takes it from Spain in a war before it achieves independence.


Most of the Caribbean as well...
Possibly. Two factors that potentially mitigate against taking too large a part of the Caribbean are that internally those individuals who already own interests in sugar cultivation will lobby against it so as to avoid competition and internationally they're considered so valuable that they might be better off used as bargaining chips for territory elsewhere e.g. Guadeloupe.


A British Southern Cone.
If the British get too grabby though, or give the impression of such, the rest of the world will line up against them out of self-preservation. How interested were the British in areas like the Argentine? I can only think of two invasion attempts that were ever made, one of which was done without orders under the initiative of the local commander, and neither were massive affairs.
 
Or it stays the British North America on the East Coast, Spanish Florida thru the Southwest, with Russian Alaska and parts of West Coast, and a big section of First Nations in the Middle, with more of the Russian areas taken in 1854
 
And if British North America is organized as a federation of dominions which could be the capital in which are the federal parliament,the prime minister of North American Commonwhealth and the Governor general of North American Commonwhealth?
Williamsburg,Filadelfia,Boston or New York?
 
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