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Ireland was part of the British Empire during World War I so was technically part of the war, though many people did not support it while others joined the British Army. Ireland was neutral during World War II.
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Ireland was a part of the United Kingdom in WWI and many Irishmen of both communities fought in the trenches.
Himaruya hasn't created an Ireland character yet due to the many images of Ireland in the world. Also, Ireland hasn't been in it yet because Ireland was neutral during WW2, however a lot happened during that time, like Hitler had plans to invade Ireland but scrapped them so maybe that could be a storyline if Himaruya did make an Ireland.
There are many potential answers to that, as there are many armies and tribes and empires throughout the history of the world that never invaded Ireland. There are two obvious ones that actually could have done so. The first were the Romans during the Roman Empire. The second would be the Germans during the two world wars.
Many decided to leave Ireland.
Ireland have never won the FIFA world Cup.
Ireland was a constituent country of the United Kingdom at the outbreak of war in 1914. Many young Irishmen of both communities were sent to fight and died during WWI.
None. There was no Irish Army during the First World War, as Ireland was not yet an independent country.
During World War 2 Ireland was neutral. In a strict legal sense Ireland was then still a dominion of the British Empire. However, relations between Ireland and Britain had been strained for many years. Irish citizens could serve in the British armed forces and about 38,554 did see serve.
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Officially Ireland was neutral during World War 2 but many Irish people fought on the side of the Allies.