What are the formal and informal ways the constitution has changed over time?

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Between 1870 and 1916, approximately how many immigrants came to the united states? 10 million 25 million 75 million 125 million

How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.