They did it by setting anti slavery activist to put slavery to an end.
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The women in Native American tribes often helped their men to hunt down buffalo. Then, when the buffalo were harvested, the women were responsible for skinning, cutting, and cooking the animal. They also gathered firewood, cooked, and repaired clothing and shoes. But Native American women were not simply homemakers.
The treaty of Versailles was an unfair one. The "war guilt" clause forced Germany and her allies to take all the blame for the world war. Moreover, Germany lost it's land, overseas colonies, population, and coal and iron industry. Germany was also made to pay reparations and limit their armed forces.
The treaty of Versailles was an invitation to deadlier wars in the future. In fact, it can be concluded that the treaty was a controversy in itself. Because Germany was subjected to ill treatment and was made to pay reparations beyond the country's capacity post war, it became the mojor cause for the WW II.
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I think its a or maybe b if im thinking about the right thing