1. What invention changed how slavery was practiced in the United States before 1860?

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Explanation:

cotton gin

One of the primary reasons for the re-invigoration of slavery was the invention and rapid widespread adoption of the cotton gin. This machine allowed Southern planters to grow a variety of cotton--short staple cotton--that was especially well suited to the climate of the Deep South.

labor leaders and organizations had the power to demand it.

explanation:

workers got a five-day workweek because the bcea protects and respect the rights of the employees. labor leaders and other groups demanded it.

they are best known for the cliff pueblos found throughout arizona, new mexico, colorado and utah. and for their development of desert farming.

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-lavira: )