DUBLIN, April 5 (Reuters) - U.S. President Joe Biden will visit Ireland and Northern Ireland on April 11-14 to mark the 25th anniversary of the Good Friday peace accord on one side of the Irish border and visit his ancestral home on the other, the White House said on Wednesday.

The Good Friday Agreement - signed on April 10, 1998 - largely ended three decades of sectarian bloodshed that had convulsed Northern Ireland, a part of the United Kingdom, since the late 1960s and took the lives of over 3,600 people.

However the anniversary has been overshadowed by a year-long boycott by Northern Ireland's largest pro-British unionist party of the power-sharing devolved government central to the 1998 deal. The party is angry over post-Brexit trade rules that treated the province differently to the rest of the U.K.

Biden will travel to Northern Ireland from April 11-12 to mark the "tremendous progress" since 1998 and underscore the United States' readiness to support Northern Ireland's "vast economic potential", the White House said in a statement.

The British government and the European Union reached a deal in February to ease post-Brexit trade rules between Northern Ireland and the rest of the U.K. But the political stalemate has yet to be resolved.