Which of the following was a curse of the great migration

The great migration was thought to be a better future for the African-Americans but instead it was the opposite since the bad smoking and drinking habits of the overcrowded urban life caused an increase of death between them and some of the following were the cause of mortality:

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explanation:

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.