How did the Republican Party manage to gain so much support in the 1850s?

Question

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The Republican Party gained support in the 1850s because it advocated for the prohibition of slavery in the territories. This stance was popular among northern voters who were increasingly opposed to the spread of slavery into new states and territories. The party's stance on other issues, such as immigration and labor laws, were not significant factors in its rise to popularity.

How Did the Republican Party Manage to Gain So Much