Explaining how the new land acquired in the mid 1800’s led to conflict over slavery and eventually to the Civil War.

One of the primary reasons for the reinvigoration of slavery was the invention and rapid widespread adoption of the cotton gin. This machine allowed Southern planters to grow a variety of cotton - short staple cotton - that was especially well suited to the climate of the Deep South.

Explanation:

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they wanted the u.s. to fight on the side of the central powers.