When was the Warsaw Pact formed?

Question

In the USA in 1912, Theodore Roosevelt formed the Progressive Party when he lost the Republican nomination to William Howard Taft. What was the party also known as?

Answer 1

May 1955
The Warsaw Pact, or Treaty of Warsaw, was a collective defence treaty between the Soviet Union and seven other Eastern Bloc socialist republics of Central and Eastern Europe. It was a pact in Soviet-dominated East Europe, similar to the North Atlantic Treaty Organization (NATO) in western Europe.