Question

what led directly to the formation of the republican party?
passage of the kansas-nebraska act
the outcome of the mexican-american war
stephen douglas’s failed run for us senate

Explanation:

The Republican Party was formed in response to the passage of the Kansas - Nebraska Act (1854), which reopened the issue of slavery in the territories and led to the dissolution of the Whig Party and the formation of a new party opposed to the spread of slavery. The outcome of the Mexican - American War (ended in 1848) and Stephen Douglas's failed run for Senate were not the direct causes of the Republican Party's formation.

Answer:

A. passage of the Kansas - Nebraska Act