Select all the correct answers. What were two main goals of the Lewis and Clark expedition? to learn about American Indian military skills and weapons to survey the land and gather geographical information to set up military outposts that US soldiers could occupy o to find a continuous water route from the Mississippi to the Pacific to identify fertile areas that farmers from the east could settle

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One of the greatest controversies to come out of World War II was whether the atomic bomb was necessary to bring about the war's end. Supporters of the bombings generally believe that they prevented an invasion of the Japanese mainland, saving more lives than they took by doing so. Opponents contend, among other arguments, that the bombings were unnecessary to win the war or that they constituted a war crime or genocide. Whether the atomic bombings truly forced the Japanese surrender, and whether projected casualty rates for the Japanese invasion were accurate, have been controversial issues for historians to tackle.