Which event pushed the Western Allies to seek a military alliance?

The communist takeover of the Czech government with Soviet support was what pushed the Western Allies to seek a military alliance, known as NATO, the North Atlantic Treaty Organization.

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

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your answer would be (a)