No it isn't... Well sort of anyway.
Northern Mexico is known to be the southernmost point of NA while Southern Mexico is considered "Central America". But Key West is the southernmost point of the USA if that is what you are looking for.
90 miles from the Southernmost point of Key West.
The southermost point and/or city in the U.S. State of Florida just happens to be "Key West." Source(s): Educational Resources
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Florida
The southernmost point of Florida (the south point of Key West) is approximately 90 miles (140 kilometers) from Havana.
It is an island that is the southernmost point in the united states, located southwest of mainland Florida. It is also connected by bridges ROM mainland Florida.
Key West (EYW) in the continental united states.
Key West, Florida for the contiguous States and the Big Island of Hawaii for the US States.
Key West - the southernmost city in the US - is located in Florida.
Austin, Texas is the southernmost capital of the US. Key West is the southernmost city in the 48 contiguous states, and contains the southernmost point visited by the public.