What was the significance of Bloody Sunday in Ireland?

Answer 1

Bloody Sunday in Ireland could refer to 1920 or 1921, when the British killed many Irish nationalists. It led to stiffening resistance to British rule, and to Ireland's independence.

A few years earlier, Britain hung Sir. Roger Casement, another Irish nationalist. It made him a martyr.

The Bloody Sundays helped Ireland become independent, sooner. Even in WW2, as Germany bombed Britain, Ireland remained neutral and sympathetic to Hitler, not because the Irish liked Nazis or Hitler, but because they had increasing distaste for Britain.

Britain lost most all of its Empire and colonies, eventually, but the Bloody Sundays sped up Irish self rule.