According to historians what marked the beiginmimg of the civil war

On March 4, 1861,Abraham Lincoln,becomes the sixteenth president of the United States in Washington, DC. On April 12, 1861, the Southern forces fire upon Fort Sumter, South Carolina. That's how the war began. Hope it helps.

not sure but thinking i'ts cause the government was broke. not sure

the constitution gives congress the power to regulate commerce "among" the several states.