The answer for this question is: <span>the election of Abraham Lincoln as President
Abaraham Lincoln was always known as someone that really see slavery as something that undermines human's value.
Not long after elected as president, Abraham Lincoln made several policies that make it harder for the southern states to keep their slaves, which led to the first secession.</span>
It allowed for simpler and more efficient bill to law process, without having each body to pass a given bill separately.
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The state governments may vary in amount of power shared with the central government.
