United Ireland is incapable of being part of the country United Kingdom.
In 1973, the population of Northern Ireland was granted a referendum on whether Northern Ireland should remain part of the United Kingdom or join with the Republic of Ireland to form a united Ireland
 In February 2021, several unionist parties began a legal challenge, alleging that the protocol violated the Act of Union 1800, the bill which had originally merged Ireland with the United Kingdom, as well as the Good Friday Agreement

