What is the Manifest Destiny--
In the 19th century, Manifest Destiny was a widely held belief in the United States that American settlers were destined to expand throughout the continent. Historian Frederick Merk says this concept was born out of "A sense of mission to redeem the Old World by high example...generated by the potentialities of a new earth for building a new heaven".
Indians fight back.
Indians don't want to leave, but they are forced so they fight back.
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Westward expansion was important because Northern farmers need new land to make more money.