Obama also is slated to meet separately Tuesday with Peter Robinson, the leader of Northern Ireland's Catholic-Protestant government.
In the late 1960s the population was about one-third Catholic and two-thirds Protestant.
Some revisionist history can leave the reader up in the air, wondering why, in the light of the historian's myth-busting, Catholic and Protestant bothered to quarrel with each other at all.
The commission argued that viewing sectarianism as "Protestant-Catholic religious prejudice, political factionalism, or even 'tribalism' " placed it outside the context of well-established international human rights law, specifically the International Convention on the Elimination of All Forms of Racial Discrimination, which came into force back in 1969.
He has supporters, including the Catholic and Protestant churches of Scotland and two-thirds of Scottish lawyers, according to one poll.
Alliance, as an identifiably centre ground party, is the one bucking the trend - with 51% Protestant backing and 36% Catholic support.
BBC: Opinion poll indicates NI voters would reject Irish unity
Clashes also erupted between pro-British and pro-Irish groups at a point where predominantly Protestant and Catholic communities meet.
It says the outcome of the referendum means that Sweden and Britain are less likely to join the currency soon, and reinforces the division between what it calls a "continental, mostly Latin and Catholic" Europe and a northern Europe which is "protestant, market-oriented and free trading, sceptical of real political integration".
In part the success was explained by his high-profile role during a stand-off in Drumcree between members of the Protestant Orange Order and local Catholic residents.
Mrs Nelson worked, lived and died in the small town of Lurgan, five miles from Portadown, where communal hatreds have festered because of the long-running dispute over the march by the Protestant Orange order through the Catholic Garvaghy Road.
Neil Lennon was hounded out of the Northern Ireland national team by a hardcore of protestant fans unhappy about the prominent role of a Celtic player - a club with historical Irish Catholic roots.
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