No state joined the union in 1800. Ohio was the first state to join the union in the 1800's. Ohio was admitted into the Union on March 1, 1803 becoming the 17th state to join the Union.

There have been three separate Act of Unions, all used by the United Kingdom.

The first, the Act of Union 1707, united the countries of Scotland and England (forming Great Britain).

The second, the Act of Union 1800, united the countries of Ireland and Great Britain (forming the United Kingdom).

The third, the Act of Union 1840, united the Upper and Lower Canadian legislatures, forming a single Province of Canada within the United Kingdom.

Home Rule in Ireland was the demand to cancel the Act Of Union of 1800 and confer a degree of Independence on Ireland.

On 1 May 1707, the Kingdom of Great Britain was created by the political union of the Kingdom of England (which included Wales) and the Kingdom of Scotland. Almost a century later, the Kingdom of Ireland, already under English control by 1691, merged with the Kingdom of Great Britain to form the United Kingdom with the passing of the Act of Union 1800. This was a set of complementary Acts which merged the Kingdom of Great Britain and the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland. It consists of two complementary Acts by the British and Irish parliaments, which were passed on 2 July 1800 and 1 August 1800, respectively. The union was made effective on 1 January 1801. The Irish Act of Union was repealed in 1962, but its British counterpart remained in force until 1983.

when combined with the act of union, passed in the 1800. witch legally joined England and Ireland as one, Catholic rights became an oxymoron.