The Whig Party was one political party which had a lot of influence in the mid 19th century in America and was especially popular and influential in the North and South, but the Southern Wigs were more vocal on the issue of slavery.
The two major reasons which led to the collapse of the Whig Party are:
Please note that your question is incomplete so I gave you a general overview of the Whig Party and the factors which led to its dissolution.
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