The history of the United Kingdom begins in 1707 with the Treaty of Union and Acts of Union. The core of the United Kingdom as a unified state came into being with the political union of the kingdoms of England and Scotland, into a new unitary state called Great Britain.
The first decades were marked by Jacobite risings which ended with defeat for the Stuart cause at the Battle of Culloden in 1746. In 1763, victory in the Seven Years' War led to the growth of the First British Empire. With defeat by the US, France and Spain in the War of American Independence, Great Britain lost its 13 American colonies and rebuilt a Second British Empire based in Asia and Africa. Politically the central event was the French Revolution and its Napoleonic aftermath from 1793 to 1815, which British elites saw as a profound threat, and worked energetically to form multiple coalitions that finally defeated Napoleon in 1815. The Acts of Union 1800 added the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland.