President Ronald Reagan issued his challenge — “Mr. Gorbachev, tear down this wall!” — at the Brandenburg Gate in 1987. European history has also been America’s history as a European power.

President Donald Trump is letting the world know that the days of American foreign policy malaise are over. European leaders, ...

When the U.S. this week opposed a UN motion condemning the Ukraine invasion, some European officials knew the transatlantic relationship was in deep trouble.

In his 1985 State of the Union address, Reagan told the nation, “We must stand by all our democratic allies. And we must not ...