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During the western cattle boom, the open range system allowed ranchers to graze herds on the open range, meaning public land once owned by the Plains Indians and their buffalo herds.
The western cattle boom brought thousands of settlers, mostly cattle ranchers that used the grasslands of the Great Plains to raise and sell cattle. The subsequent economic growth added to America's ascent to power.
The one that was not a critical event during the late stages of the cold war from 1968 to 1991 was: rise of the Solidarity trade union and political movement in Poland
The late stage of cold war filled with events that contribute to the fall of the soviet Union. Solidarity union and Poland's condition has nothing to do with it.