Final answer:
Coal and natural gas are the two primary sources of energy production in the United States.
Explanation:
Types of Energy in the United States
In the United States, the highest energy production is predominantly from coal and natural gas. According to provided data, coal accounts for 50% and natural gas for 19% of the nation's power generation.
This data emphasizes the importance of coal and natural gas as major sources of energy production in the United States.
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