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.
No, the Conch Republic is not an independent country. It is a micronation that was established in 1982 in Key West, Florida, as a satirical secessionist movement in response to a U.S. Border Patrol checkpoint. The Conch Republic exists as a symbolic entity and does not have official recognition as a sovereign state.
Spain and Great Britain likely claimed land that bordered the disputed area of the Pacific northwest in 1763.
Hawaii is not an independent country; it is a state of the United States. However, in terms of land area, Hawaii is one of the smallest states in the U.S. It consists of a group of islands and ranks as the 8th smallest state by land area.
US is an abbreviation for the nation known as the United States of America, United States, or colloquially called America. It rests on the North America continent and shares borders with Mexico and Canada. The United States of America is not a continent, but a country.
The United States is bordered by Canada to the north, Mexico to the south, the Atlantic Ocean to the east, and the Pacific Ocean to the west.
Mexico did.
The US is bordered to the south by Mexico.
Canada
There are no countries in the US.
The US is bordered to the south by Mexico.
It is bordered by Canada to the North & the US to the South.
When the US became independent, they bordered France (by Louisiana), Spain (by Florida), and Great Britain (by Canada).
Canada is bordered by the US only.
Ireland is an independent country and it is not in the US.
France.
No, Haiti is an independent country.
Americas became independent from Britain