Jurisdiction is a court's authority to hear and decide cases. Concurrent jurisdiction both the state and the federal courts may try crimes because they violate both state and federal crimes. Both court systems may also hear dispute between citizens of two different states over a lawsuit.
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Child labor was big back in the 1890s. Children were deprived of their childhood. Instead of playing and having fun they were put to work. Instead of school they had to provide for their family. Ages 10 and up started to work. Most work places like coal mines were very harmful to the kids. Just from breathing the pollution in to cutting them self on work equipment it was a very dangerous place. In 1938 child labor was officially discontinued.