The United States of America is bordered by two countries, not continents: Canada and Mexico. To the west of Alaska is Asia, however, not being landlocked, one does not say that they border eachother.
Asia, Africa, Europe.
North America and South America share a land border with the United States.
The two continents that border the Black Sea are Asia and Europe. The Black Sea is wedged in between these two continents.
Canada, Mexico, and Russia border the United States.
Australia, who is fully in the Eastern Hemisphere, does not border any other continents. Antarctica, who is partially in the Eastern Hemisphere, does not border any other continents as well.
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Asia Africa Australia
Europe, Asia, and Africa
Asia, Africa, Europe.
Only two continents border the Red Sea, they are Asia and Africa.
The two continents are Europe and Africa.
The three US states which border California are Oregon, Nevada, and Arizona.
The Persian Empire was established in Asia, North Africa and Eastern Europe. That makes three continents. Your other four continents were not involved.
No continents border Antarctica. The continent is surrounded by the Southern Ocean.
North America and South America share a land border with the United States.
There is no answer to that question. There aren't three continents that are part of the US. The United States is a country, it does not have any continents in it. It itself is part of the continent of North America.
The Arctic Ocean straddles the earth's northern pole. No continent has the Arctic Ocean as a western border; two or three continents have the Arctic Ocean as a northern border: North America and Eurasia (or Europe and Asia).