Why can Ireland, which is close at hand, be independent from the "strong" Britain?

Why can Ireland, which is close at hand, be independent from the "strong" Britain?
Ireland is near the British mainland, and you can get there by boat for dozens of kilometers.

as we all know, the 20th century was the century in which Britain fell from the Japanese empire to the altar, and the most important symbol was the disintegration of its colonial system. It is easy to understand that India, Canada, and South Africa can be independent across continents. After all, the declining "Boing" cannot reach out that long. But Ireland is near the British mainland and can be reached by a ship of dozens of kilometers. Britain, as one of the five permanent members, can suppress Ireland no matter how it is done. How did Ireland become a republic from Britain?

England's cruel colonial rule of Ireland

Ireland sounded the bugle of the War of Independence

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