Laws In Wales Acts 1535-1542 , passed by the Parliament of England, annexing Wales to the Kingdom of England are sometimes known as the "Acts of Union"
Acts Of Union 1707 , passed by both the Parliament of England and the Parliament of Scotland to form the Kingdom of Great Britain.
Act Of Union 1800 , passed by both the Parliament of Great Britain and the Parliament of Ireland to form the United Kingdom of Great Britain and Ireland.
Act Of Union 1840 , passed by the Parliament of the United Kingdom, joining Upper Canada and Lower Canada (to form the Province of Canada).
In Scandinavia:
Act Of Union 1814 forming a personal union between Sweden and Norway
OTHER MEANINGS
An agreement between the Presbyterian and Congregationalist churches, within the United States
The term "act of union" is also used as a euphemism for Sexual Intercourse
