Because they were forcibly removed by their employers because many of the men who comprised most of the military returned to their former jobs in the labor force.
When your ability to divide your attention is impaired the the chances of being in a collision increases 50%
A contentious issue at the 1787 Constitutional Convention was whether slaves would be counted as part of the population which they were deciding if they be under the representation of the states in the Congress or would instead be considered property and, as such, not be considered for purposes of representation.
One of the greatest compromises made that allowed the Constitution to be ratified was the inclusion of the Bill of Rights, which the Anti-Federalists insisted on since they didn't want the government to become too powerful.