Answer:
when the the civil war started?
Explanation:
<span> during WWII, the </span>Americans<span> succeeded by </span>developing<span> a secret </span>code<span> based on the language of the </span>Navajos<span>.</span>
<span>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. The labor movement led efforts to stop child labor, give health benefits and provide aid to workers who were injured or retired.</span>