Question: Who were the leaders of the opposition party that was created as a result of the kansas-nebraska act?

Knowledge 1: Kansas–Nebraska Act
The Kansas -- Nebraska Act divided the nation and pointed it toward civil war. The Act itself virtually nullified the Missouri Compromise of 1820. The turmoil over the act split both the Democratic and Whig parties and gave rise to the Republican Party, which split the United States into two major political camps, the Republican North and the Democratic South. [SEP] Knowledge 2: Republican Party (United States)
Founded in the Northern states in 1854 by anti-slavery activists, modernizers, ex Whigs and ex Free Soilers, the Republican Party quickly became the principal opposition to the dominant Democratic Party and the briefly popular Know Nothing Party. The main cause was opposition to the Kansas -- Nebraska Act, which repealed the Missouri Compromise by which slavery was kept out of Kansas. The Northern Republicans saw the expansion of slavery as a great evil. The first public meeting of the general ``anti-Nebraska ''movement where the name`` Republican'' was suggested for a new anti-slavery party was held on March 20, 1854, in a schoolhouse in Ripon, Wisconsin. The name was partly chosen to pay homage to Thomas Jefferson's Republican Party.
Knowledge 1: Kansas–Nebraska Act
The Kansas -- Nebraska Act divided the nation and pointed it toward civil war. The Act itself virtually nullified the Missouri Compromise of 1820. The turmoil over the act split both the Democratic and Whig parties and gave rise to the Republican Party, which split the United States into two major political camps, the Republican North and the Democratic South. [SEP] Knowledge 2: Modern history
The Antebellum Age was a period of increasing division in the country based on the growth of slavery in the American South and in the western territories of Kansas and Nebraska that eventually lead to the Civil War in 1861. The Antebellum Period is often considered to have begun with the Kansas–Nebraska Act of 1854,[citation needed] although it may have begun as early as 1812. This period is also significant because it marked the transition of American manufacturing to the industrial revolution.[citation needed]
Knowledge 1: Modern history
The Antebellum Age was a period of increasing division in the country based on the growth of slavery in the American South and in the western territories of Kansas and Nebraska that eventually lead to the Civil War in 1861. The Antebellum Period is often considered to have begun with the Kansas–Nebraska Act of 1854,[citation needed] although it may have begun as early as 1812. This period is also significant because it marked the transition of American manufacturing to the industrial revolution.[citation needed] [SEP] Knowledge 2: Republican Party (United States)
Founded in the Northern states in 1854 by anti-slavery activists, modernizers, ex Whigs and ex Free Soilers, the Republican Party quickly became the principal opposition to the dominant Democratic Party and the briefly popular Know Nothing Party. The main cause was opposition to the Kansas -- Nebraska Act, which repealed the Missouri Compromise by which slavery was kept out of Kansas. The Northern Republicans saw the expansion of slavery as a great evil. The first public meeting of the general ``anti-Nebraska ''movement where the name`` Republican'' was suggested for a new anti-slavery party was held on March 20, 1854, in a schoolhouse in Ripon, Wisconsin. The name was partly chosen to pay homage to Thomas Jefferson's Republican Party.

Answer: anti-slavery activists, modernizers, ex Whigs and ex Free Soilers