Which countries joined NATO in 1999?

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Flag of NATO featuring a white compass rose emblem with four lines radiating from the center on a blue background. — North Atlantic Treaty Organization Flag of the North Atlantic Treaty Organization (NATO).

In 1999, three countries joined the North Atlantic Treaty Organization (NATO) as part of an initiative to enlarge the alliance to include former Soviet allies.1

The countries that joined in 1999 are:

Czech Republic1
Hungary1
Poland1