Southerners claimed that abolitionist victories were creating a "wedge" in
the Union. What did that mean, and were they correct?

A wedge between two people can weaken any relationship. it is known to oppose or turn against one another

The abolitionist movement made a great impact as it turned slavery into an emotional and political topic of concern.

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The correct answer to this open question is the following.

Southerners claimed that abolitionist victories were creating a "wedge" in the Union. What they meant by this was that people from the South -who heavily supported slavey in their territories- thought that as abolitionists' ideas spread to the northern states, these somehow weakened the Union in that these ideas confronted their people through so much debate. For the southerners, this represented an advantage and creation distraction while the South gained time and maintained slavery in the large plantations, producing the kinds of crops that moved their economy.

Were they correct? Not at all but they had a point in that so much debate on the issue of slavery and the increasing idea of abolitionism distracted decision-makers in the northern states. Those were the years were more supporters of abolition made their moves. For instance, in Rochester, New York, Frederick Douglass led the newspaper "The North Star," an abolitionist publication that somehow exerted pressure in the public opinion.

yes i can of course like what is it gonna be about

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774