England did not unite with Northern Ireland. Ireland was at one time part of the British empire. Ireland, England, Scotland and Wales became the United Kingdom in 1801. In 1922, the Republic of Ireland became independent and Northern Ireland was formed and remained in the United Kingdom.
There is a trade union in Ireland called Unite. See the link below.
Because Eamon Devalera(irish president at the time) allowed the british to keep 6 counties, from the original 32,ultimately this led to the assassination of Michael Collins by anti treaty forces.
If Northern Ireland and the Republic tried to unite, the Unionists in the North would never agree and it would just lead to more fighting. It's best to leave things as they are because now there is peace and the Troubles are over.
Unite
1990
The United Kingdom.
The motto of People's Socialist Republic of Albania is 'Workers of the world, unite!'.
The crosses of St.George,St.Andrews,St Patrick representing England,Scotland And Ireland in The Union Jack unite Britain.
The IRA want this.
If relating to the Democratic Republic of the Congo: Justice, Paix, Travail. Meaning: Justice, Peace, Work. If relating to the Republic of the Congo: Unite, Travail, Progres. Meaning: Unite, Work, Progress.
There have been a number of them, with the main being the IRA (Irish Republican Army).