1. What does the term 'Union of Crowns' specifically refer to in history?
The personal union in 1603 when James VI of Scotland also became James I of England, under one monarch.
Explication
The 'Union of Crowns' in 1603 refers to the personal union when James VI of Scotland also became James I of England, uniting the two crowns under one monarch, but the two kingdoms remained separate states with their own institutions.