I believe the answer is A
The election was held on Tuesday, November 6, 1860. In a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin emerged triumphant. ... By 1860, the Republican Party had replaced the defunct Whig Party as the major opposition to the Democrats.
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The populist demanded "Decrease Immigration"
They used new military tactic and weapons that were never used or tested before
Answer :Declaration of war
Explanation: In the United States House of Representatives, a group of young Democratic-Republicans known as the "War Hawks" came to the forefront in 1811, led by Speaker of the House Henry Clay of Kentucky and John C. Calhoun of South Carolina.