So if the vice president (president of the Senate) isn’t present, the president pro tempore (senator who’s been there the longest from the majority party) will take over.
The event that triggered war came at Fort Sumter in Charleston Bay on April 12, 1861 because of uncompromising differences between the free and slave states over the power of the National Government to prohibit slavery in the territories that had not yet become states.
C because it the right answer
The answer is D because, that is the only answer that shows history in the light of great activity. B and C are irrelevant and A, means they were being controlled.