Which issue led to the decline of the Whigs as a national force by the late 1850s?

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The issue of slavery ultimately led to the decline of the Whigs as a national force by the late 1850s. The party was divided on the issue, with some members supporting the expansion of slavery and others opposing it. This caused the party to lose support from both sides, and many former Whigs joined the newly formed Republican Party, which was firmly opposed to slavery. This weakened the Whigs and ultimately led to their demise as a dominant political force in the US.

Which Issue Led to the Decline of the Whigs as a National