How did religion cause Ireland and northern Ireland to become two separate countries?

Facing civil war in Ireland, Britain partitioned the island in 1920, with separate parliaments in the predominantly Protestant northeast and predominantly Catholic south and northwest. However, the republicans opposed the formula, and in 1922 the Irish Free State was formed.

Explanation:

Below:

Explanation:

While Britain was Protestant, most of the Irish were Catholic — and with these religious differences came a deep-seated cultural divide. To help bolster its control, London planted settlers — Protestant settlers mostly from Scotland.

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