It could be argued that the main reason the attack at Pearl Harbor was so damaging is because at the time of the attack "nobody was prepared," since it took American troops longer than it should have to retaliate and return fire.
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Mining played an important role in the settling of the American West. Demand for minerals rose dramatically after the Civil War as the United States changed from a farming nation to an industrial nation. Mining also led to the building of railroads to connect the mines to factories back east.
Answer:
The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.