It also includes the effects of political manipulations, big business, greed, and outside influences on government. To make a 500 year story short, the Scots had their own monarchy and the English had theirs. The king of Scotland was elected from among the royal family by the Scotish parliament. The king of England was determined pretty much by inheritance, with certain stipulations set down by the English parliament. After fighting a few wars for various reasons, marriage between members of royal families united the two countries under one monarchy.
Monarchs come and go.
Some were of one religion, some of another, but generally they tried to impose their religious and political opinions on their subjects, sometimes by harsh methods. Generally, the kings wanted to make everyone in Scotland follow the Episcopal church, while many Scots were faithful to the Catholic or Presbyterian church. Presbyterians in Scotland signed a covenant with God to oppose all other religions. They were called Covenanters. Some subjects believed that being a king of Scotland was a divine right given only to the descendents of King James.