As chairman of the Social Democratic and Labour Party (SDLP), he devised and designed a solution to the problems that were supported in London and Dublin, Washington and Brussels, and then in Northern Ireland, during the massive vote in favour of the 1998 Good Friday Agreement. One of them was the Catholic leader of the moderate Social Democratic and Labour Party, John Hume, considered by many to be the main architect of the peace agreement. After joining the Northern Ireland civil rights movement in the late 1960s, he was convinced that nationalism was a diminishing force in the new Europe. It believes that Northern Ireland needs greater autonomy, with powers reasonably distributed among the people: better relations must be established between Northern Ireland and the Republic of Ireland, as well as between London and Dublin. .