Partition of Ireland did not begin with the events of 1916

His claim that “In 1801, we signed up to go into union with Britain” is both factually incorrect — the vote of The Parliament of Ireland took place in 1800 — and grossly misleading in that no popular vote of the people ever took place. Ireland was carried into the union by a parliament where only Anglicans were permitted to sit and for which only wealthy Catholics were allowed to vote.
This was hardly an exercise in democracy in a country where the majority of the population were impoverished Catholic, with many Presbyterians in Ulster.