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When?

The only two countries that currently border the US are Canada and Mexico. Canada became independent in the 1860s, and Mexico became independent (in intention at least, the same way the US claims "independence" in 1776, despite the fact that it took until 1783 and a bit of a spat for that independence to be formally recognized by Britain) in 1810. Neither of those are exactly "new." So clearly you must be talking about some historical date, and since you haven't given that, we can't guess.

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11y ago

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