Final answer:
Scotland was fully incorporated into Great Britain through the Act of Union in 1707 under Queen Anne's reign.
Step-by-step explanation:
The country that was fully brought into Great Britain by a monarch was Scotland. The Act of Union 1707 was passed under the reign of Queen Anne, the last Stuart monarch of England, which effectively united the Parliaments of Scotland and England and led to the inception of Great Britain.
The political force of the monarchy in England was further solidified by the Tudor dynasty, during which efforts for overseas exploration and colonization were made, particularly under Henry VII's reign.