Final answer:
Queen Anne was the last monarch of the Stuart dynasty, and upon her death, the throne passed to the Hanoverian dynasty with George I.
Step-by-step explanation:
Queen Anne, who died childless in 1714 despite having 18 pregnancies, was the last monarch of the Stuart dynasty. After her death, the English Crown passed to the nearest Protestant relatives of the Stuarts, the Electors of Hanover, leading to the accession of George I as the first Hanoverian monarch of England. Prior to Anne, the joint rule of William and Mary and then William's sole rule after Mary's death, led to the unification of the Parliaments of Scotland and England under the Act of Union, resulting in England being known as Great Britain. The end of the Stuart line and the beginning of the Hanoverian era were significant in British history.