Because of wide variations in seasonal and annual precipitation
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A . cultural patterns that can change quickly and that are accepted by the majority of the people .....is your answer
Some labor unions opposed immigration because their members believed immigrants would take jobs away from native-born americans. So this was a way to protect the native-born americans in their way.
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The Romans arrived in Britain in 55 BC. The Roman Army had been fighting in Gaul (France) and the Britons had been helping the Gauls in an effort to defeat the Romans. The leader of the Roman Army in Gaul, Julius Caesar, decided that he had to teach the Britons a lesson for helping the Gauls – hence his invasion.