It outraged opponents of slavery
The factor that benefited the Republican Party in the 1970s was: <span>reaction by some white southerners to passage of civil rights laws
Back then, the southerners still haven't supported the equal civil rights laws for the minority citizens. This massively decreased Kennedy's support that became the Republican main opposition during that time.</span>
They were upset because the law forbade them from settling in the Ohio River Valley where there was fertile soil for farming, and the Native Americans weren't using it, plus many colonists had already bought land west of the Appalachians and now weren't allowed to move. Many colonists did not respect the Native Americans and did not want to preserve their land. The colonists just ignored the law and moved across the Appalachians.
