The bubonic plague caused mass death and it was caused by the lack of sanitation systems throughout medieval towns. The peasants/serfs demanded more and more as the rich people needed more to supply themselves. Eventually, the peasants got a say in government for this. The bubonic plague also caused a lot of the roman empire to die.
Lakota, Cheyenne, and Arapaho people had good reasons not to trust the U.S. government or the Union Pacific Railroad Company, including a bitter history of broken promises and violence toward native communities. They were among the tribes that signed the Treaty of Fort Laramie in 1851.
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Poor workers were often housed in cramped, grossly inadequate quarters. Working conditions were difficult and exposed employees to many risks and dangers, including cramped work areas with poor ventilation, trauma from machinery, toxic exposures to heavy metals, dust, and solvents.
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I dont see a question so how is there a good answer?