How did Picasso's Blue Period begin?

In the latter part of 1901, Picasso sank into a severe depression and blue tones began to dominate his paintings. ... The painting considered the first of his Blue Period, Casagemas in His Coffin, was completed later in 1901 when Picasso was sinking into a major depression.

Explanation:

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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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