President Donald Trump stirred debate during his visit to Dublin by saying he would like to see a united Ireland and that unification is eventually inevitable, departing from the caution US presidents have traditionally shown on the issue. The United States is officially neutral on an issue that had been a source of decades of violence in Northern Ireland until a 1998 peace deal. Key points and original sources are listed below.

• President Donald Trump stirred debate during his visit to Dublin by saying he would like to see a united Ireland and that unification is eventually inevitable, departing from the caution US presidents have traditionally shown on the issue. Bloomberg News White...S1

• The United States is officially neutral on an issue that had been a source of decades of violence in Northern Ireland until a 1998 peace deal.S2