As one of the countries with the most advantageous environment in Europe, when did the Republic of Ireland become completely independent?

Ireland was the first colony acquired by the British Empire during its expansion. However, after hundreds of years, Britain failed to absorb Ireland as thoroughly as it conquered Scotland and Wales. Instead, it was unable to digest it. After the two world wars, the British Empire, known as the "Empire on which the Sun Never Sets," was severely weakened and could no longer maintain its huge global colonial system. Even Ireland, which was just around the corner, could no longer control it. In the end, Britain and Ireland compromised with each other and gained Irish independence at the expense of Northern Ireland.

Around 300 BC, the Celts, known as one of the three major barbarian tribes in Europe, came to Ireland and mixed with the locals, forming the ancestors of today's Ireland. The Irish are therefore far removed from Anglo-Saxon Britain in blood and culture. But more similar, closer to the Scots.

In the 16th century, King Henry VIII of England declared Ireland to be British territory. During the period of King Edward VI of England, the British immigrated to Ireland on a large scale to colonize Ireland. However, many years later, Ireland still did not surrender to the British. With the support of Spain, which was fighting Britain at the time, Ireland fought against Britain everywhere, and Britain also carried out various brutal suppressions against Ireland.

After the Industrial Revolution, the British economy rose rapidly, but the gap between Britain and Ireland became wider and wider. When the proportion of modern industry in the British economy increased, the Irish economy became increasingly dependent on agriculture, and a large number of Irish people emigrated overseas. Especially after the Great Famine in Ireland, the British people looked on with cold eyes, causing the population of Ireland to plummet, which also filled the hearts of the Irish with hatred.

After World War I, Ireland launched a war of independence, and Britain was severely weakened. In the end, the British, who had no choice, were forced to sign the Anglo-Irish Treaty with them. Of the 32 counties in Ireland, 26 counties in the south left the UK and 6 counties in the north remained. As a result, the Republic of Ireland was born, and the United Kingdom was officially renamed the "United Kingdom of Great Britain and Northern Ireland". In this way, Ireland officially separated from the United Kingdom and became the third island country in Europe after the United Kingdom and Iceland. Due to its rapid economic rise, Ireland is known as the "European Tiger" and is one of the countries with the most developed economy and the most superior environment in Europe.