What were the causes for the expansion of slavery in the 1800s?​

Which of the following best states am argument of french philosopher jean-jacques rousseau

What do historians call the political,social,or cultural circumstances surrounding an event?

During the early neolithic era, people relied on domesticated animals to provide each of the following except a. hides for clothes b. labor to pull plows c. manure for the soil d. meat, cheese, and milk for food