Tradionally, people have relied on what in order to explain social problems

monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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hello most volcanoes are located at either divergent or convergent plate

this is where the plate motions aswell form magma