Big changes are coming to America’s relationship with Europe. This was the subtext of remarks by Secretary of State Marco Rubio and other top Trump administration officials during the recent Munich Security Conference. Change is never easy, but the shift proposed by Rubio and others is long past due, both for the United States and its European allies.

NATO is the most successful military alliance of the modern era. But the world is very different from when NATO was launched in 1949. And like any successful relationship, NATO will have to adapt to a new era.