After the homo sapiens moved out of Africa, they traveled to Mesopotamia where pastoralism became the way of life around 5500 BCE. It was here that in 3500 BCE, pastoral nomadic communities began to emerge and some of the first complex irrigation systems were created.
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In general, organized labor was very successful in improving the position of workers in the period from 1875 to 1900 because of the formation of unions, which protected workers against dangerous working situations.