A group that wanted to end slavery was the Abolitionist movement of the late 1700s and early 1800.
It was an effort in the USA that promoted the belief that all men are created equal. With time the abolitionists grew bold in their demands while slave owners resisted and became entrenched in opposing the abolitionists, a situation that fuelled regional divisiveness that ultimately resulted in the American civil war.
The abolitionist kept pressing the Lincoln administration to end slavery and in 1863, the Emancipation Proclamation was made.
The answer is True for sure.
; Abundant labor supply<span>; Railroads; </span>Labor<span> saving </span>technological<span> advances
are some answers
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In colonial America, Africans "contributed" to society by being a source of income for people who bought and sold them into slavery. They also contributed by being laborers in the southern plantations.
Women contributed to the society by being a house wives --meaning they took care of the house-- as well as cooking meals for the family and taking care of the children.
Native Americans, in the earlier days, contributed by trading with settlers and teaching them how to do things in their environment.
(Sorry I really don't know what the children did)