1. The USA is the fourth largest country after Russia, Canada and China.
2. The external borders include those with Puerto Rico, American Samoa, and the Virgin Islands.
3. The 48 states border with Canada to the north and Mexico in the south.
4. The USA has a maritime border with the Russian Federation.
5. The USA borders three oceans: the Arctic, Atlantic and Pacific.
6. The USA is highly developed industrial state with many industries.