Former communist nations began to join the european union in .

In 2004 ten countries joined the European Union: Cyprus, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia. Some of these countries, such as Latvia or Lithuania were formerly communist nations, which also were under the influence of the URSS during the Cold War era.

2004...i may be wrong so just try to triple check

Explanation:

b. sec, foreign relations

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).