The British government, in 1920 decided to split Ireland in 2. There was no public vote.
There was a referendum in the 70s but it was a farce.
Regardless of a referendum vote the British government has the final say whether NI separates from the UK.
The border is shaped as such to capture as many unionist/loyalist population as possible so they could hold the power.
Now 105 years later, A nationalist (Irish) political party is the larger party and the unionist (British) party was recently led by a peadophile and is honestly a joke of a political party.
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u/Ninjaisawesome 13h ago
North of Ireland*. Yeeoooooooo