Which changes took place in the united states in the late 1800s?
a- factories were mass- producing conveniences and luxuries.
b- the middle class was growing.
c- people had more leisure time.
d- blacks and other minorities
were gaining equality.

In late 1800s, in United States, the B. growth of middle class was changing.

Though the industrialization was on the verge of prosperity in the late 1800s, 'mass-production' of goods was not yet being done. More people started to get employed and thus the leisure time that the people had earlier decreased considerably.

Though the societies modernized, blacks and minorities were not given the importance they deserved as humans. Because there was a growth in the rate of employment, poor families experienced prosperity and grew to become middle class families.

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the answer is d. selective incorporation. (apex)