What are black blizzards

A black blizzard is a dust storm especially in the dust-bowl area of the U.S.

Explanation:

During most of the 1930s, the Great Plains region was devastated by drought and high winds. Howling across the Great Plains, these winds whipped up the soil of the over-farmed land and created blizzards of dust. These “black blizzards” were so thick and blinding that daylight seemed more like dusk.

Explanation:

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.

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