Only 5% Of The Population Can Score 100% On This Geography Quiz—How Well Do You Know The World?
Which country shares the longest border with the United States?

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The U.S.-Canadian border stretches 5,525 miles. This makes it the longest international boundary in the world. It spans eight Canadian provinces and territories, along with 13 U.S. states.
PETER POWER/AFP via Getty Images
PETER POWER/AFP via Getty Images
Which country shares the longest border with the United States?
- Mexico
- Alaska
- Canada
- Russia
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