Which event was most crucial in steam becoming the leading energy source in the united states by the year 1900?

The discovery an opening of large coal deposits.

Explanation:

Coal is the most widely available fossil fuel in the world and one of the first sources of energy used by man. It was widely used in the period of the Industrial Revolution in Europe. In the United States, several coal deposits were found in the mid-1900s. These deposits influenced greatly the United States industry and were the crucial factor in making steam the main source of energy in the United States in the year 1900.

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"the sepoy rebellion was the result of many, many influences and stressors on the cultures of india living under british rule. in britain, it's called the sepoy mutiny on the indian mutiny, but in india, it's called the first war of independence.

the main reason is concerned to the british paramountcy , the belief in british   dominance in india political, economic and cultural life had been introduced in india about 1820."

"they were forced to grow crops that benefited the colonizing nations instead of feeding their own people."

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