Which is the best example of a primary source document useful in the study of history

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.

Match the following events to the effects they produced. fall of constantinople italian wars hundred years’ war paved the way for the entry of renaissance ideas of peace and renewal arrowright caused an influx of classical greek and roman knowledge and texts into europe arrowright led to the introduction of renaissance thought and ideas to france arrowright

Explain the importance of carnegie, morgan, and rockefeller on the american political scene of the early 1900's.