Who fought the civil war taking place in 1642 to 1645?
the cavaliers and the royalists
the roundheads and the puritans
the royalists and the roundheads

It was the Royalists against the Roundheads during the English Civil War.  The Royalists represented the monarchy while the Roundheads presented parliament.  At first, the Royalists had the upper hand but with the emergence of the New Model Army led by Oliver Cromwell the tide turned for the Roundheads with victories such as Naseby and the fall of Bristol.  Later the forces of Parliament won.

A

some abolitionist lawmakers in north were afraid of the fact that slavery was main cause of the war (contrary to common belief that was it's main reason not the independence of texas, contrary the causes of civil war were far more complex) there was hesitation for going to war with mexico in both north and south (most prominent oppositionist was adams)