Imperialism was a cause because building an empire needs manpower such as an army and a navy to conquer and keep the land that they colonised. The alliances system meant that a local conflict could easily result into an intimidating global one
Answer:Early humans changed their environment through the domestication of animals, hunting and irrigation, Wing said. ... Many may not realize how extensively early settlers changed the environment, mainly because of persisting beliefs that primitive societies kept the land intact and lived simply with nature
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