The use of natural gas in the United States began in the early 19th century. However, it was not until the late 19th century that natural gas became widely used for heating and cooking. The discovery of large natural gas reserves in the Gulf of Mexico in the 1950s led to the rapid growth of the natural gas industry. By the early 21st century, natural gas had become the primary fuel for electricity generation in the United States.
The use of coal in the United States began in the late 18th century. However, it was not until the mid-19th century that coal became the primary fuel for industrial uses. The use of coal declined in the late 20th century as a result of environmental concerns and the increased use of natural gas and petroleum. However, coal remains an important fuel for electricity generation in the United States.