So there's this thing called continental drift, which means that the continents are always moving around.
Given enough time, and because the Earth is round (the Earth is round!),
there comes a point when all the land masses on the face of the Earth
run into each other. Eventually they drift away again, but for a while
at least they form a giant glob called a supercontinent.
Pangea
is the most recent supercontinent the Earth has had. It formed 300
million years ago and stayed that way for 100 million years before the
land masses started drifting apart again.
Here is a picture of Pangea (source: http://capitan-mas-ideas.blogspot.com/2012/08/pangea-politica.html) as it was 300 million years ago, but with today's modern political boundaries drawn in:
A bit question is, how would it be if USA bordered Africa?
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