Answer:
Explanation:This might help
Definition: Labor unions or trade unions are organizations formed by workers from related fields that work for the common interest of its members. They help workers in issues like fairness of pay, good working environment, hours of work and benefits.
Answer: Most likely the industrial revolution.
Explanation: The use of machines in production became more and more prevalent, eventually many factories were built in cities which caused pollution therefore making the air gross.
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The purpose of the Force Acts was primarily to "<span>(A) limit the actions of the Ku Klux Klan," since the Ku Klux Klan was making it difficult for the federal government to enforce the Fifteenth Amendment. </span>
<span> protect their cities from enemy invasion. I mean, how could mere pillars protect whole cities from enemies? I wouldn't say they were used for such protective purposes.</span>
