The closest foreign countries to the United States are Canada and Mexico. Canada shares the longest international land border with the U.S., while Mexico lies directly to the south. Additionally, the U.S. territory of Alaska is relatively close to Russia, with the Bering Strait separating them by only about 2.4 miles at its narrowest point.
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Mexico (borders the US) and Cuba (90 miles from the US).
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US cellphones will get signals in foreign countries if and only if your provider has collaboration with any provider in that company in that foreign country.This is called "International Roaming".
Canada and Mexico are foreign countries that border the U.S.A. Canada is to the north and Mexico is to the south.
No foreign country owns any part of a US state.
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The states people cannot trade with foreign countries or travel to foreign countries.
Chile is the southern hemisphere country that is closest to the US. Both countries have territories near the 90°W line of longitude at their closest points.
The US offers foreign aid mostly to support struggling democracies and countries that are critical to foreign policy objectives is true.
Gas
Bermuda is a British territory in the Atlantic. It has no bordering countries. The closest countries to Bermuda are the US and the Bahamas.