North Korea
Under its reckless young dictator, Kim Jong Un, North Korea has stepped up its testing of nuclear weapons and ballistic missiles, which experts fear may already be able to reach parts of the U.S. Kim also continues to threaten neighboring South Korea and the more than 28,000 U.S. troops stationed there.
China
Although China’s economy has slowed, it’s still the second largest in the world (after that of the U.S.). In recent years, many U.S. companies have opened factories in China, where labor is cheaper. President Donald Trump has criticized the resulting loss of American jobs. Trump has also vowed to counter China’s aggressive stance in the South China Sea, where it has seized territory claimed by other countries.
Afghanistan
American troops have been fighting a war in Afghanistan since 2001, following the 9/11 terrorist attacks against the U.S. But after 16 years, Afghanistan remains unstable. The Taliban, a radical Muslim group driven from power early in the war, continue to battle U.S. and Afghan forces. President Trump is expected to send an additional 4,000 troops to try to stabilize the situation.