The League of Nations was a ___

A. Group of countries that developed modern military methods
B. Peacekeeping organizations formed after World War l
C. Group of baseball teams that toured the world as goodwill ambassadors
D. Undersea exploration organization with twenty thousand members

B. Peacekeeping organisation formed after World War 1

Fun Fact: It was US President Woodrow Wilson that suggested its creation, even though the USA never joined, as Congress didn't allow it due to the American policy of isolationism.

B-Peacekeeping organizations formed after WWI

Explanation:

I just did it

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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