Great Drought | North America [1276–1299] | Britannica.

What caused the drought in the 1930s?

Abnormal sea surface temperatures (SST) in the Pacific and the Atlantic Ocean played a strong role in the 1930s dust bowl drought. ... During the 1930s, this low level jet stream weakened, carrying less moisture, and shifted further south. The Great Plains land dried up and dust storms blew across the U.S.

What was the worst drought in history?

The 1930s “Dust Bowl” drought remains the most significant drought—meteorological and agricultural—in the United States' historical record.