In the United States from the Civil War to World War II,the most important fuel was

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Coal was the most important fuel during this time period for various reasons. The Industrial Revolution had increased the demand for coal as it was used to power machines in factories and industries. It was also the primary fuel source for the steam engines that powered trains and ships, which were vital for transportation and trade during this time. Additionally, coal was abundant and easily accessible in the United States, making it a cost-effective and reliable source of energy.