When did Scotland become part of Great Britain?
At the end of the seventeenth century, there was growing dissension in England and Scotland, regarding the relationship between these two countries. William III was more interested in England because of its value to him in his European affairs.
Many people advocated that the two kingdoms should become separate states. William and his advisors were more in favour of an incorporated union, although Scottish feeling was of the opinion that such a union would stifle Scotland even further.
In 1706, Queen Anne set up a commission to draw up a treaty for union. The resultant Act decreed that two countries be united as Great Britain under one parliament and one flag. The trade, religious practices, and law making for Scotland. It became law in May 1707.