What common thread wove together northern men to form the Republican party in 1854?

Question

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The opposition to the extension of slavery into any territory of the United States was the common thread that brought together northern men to form the Republican party in 1854. This position was seen as a way to prevent the spread of slavery and promote free labor in the western territories. The party became the main opposition to the pro-slavery Democratic Party in the North and played a key role in the lead-up to the Civil War.

What Common Thread Wove Together Northern Men to Form the Republican