Oklahoma is the nation’s leading producer of

Oklahoma is the nation's leading producer of fossil fuels, primarily natural gas and oil.

Explanation:

Oklahoma is an important natural gas producer (second largest US natural gas producer). Although oil production and refining have historically dominated the state’s economy, the collapse in the energy industry during the 1980s resulted in the loss of nearly 90,000 energy-related jobs between 1980 and 2000 and seriously damaged the local economy. Despite that, Oklahoma is the third largest oil producer in America.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.