The answer is c. Civil War. The states of the South were
against any interference from the Federal government particularly on the issue
of slavery. When Lincoln was elected,
the Southern states felt that their rights to own slaves would be jeopardized and
this would lead to Civil War.
Helped make them a stronger nation but also a bigger target, the more countries you control, the tastier you look for a bigger country to take you out and take your puppeted countries.
Non-Muslim citizens were outraged at the Mughal empire's implementation of sharia law.