It's be evidence of political division, the entirely of British North America was split down ideological lines between monarchists and republicans. In British North America the cultural division was between the south and the north, the slave-owning latifundia of the Caribbean and (what is now) the US South, and the North (what are now the US north and eastern Canada). To this day there is the same cultural division, the only major change being the disappearance of whites from most of the Caribbean. People in Mass have more in common with Newfoundlanders than the do with Georgians, and so on.