What Ireland relied on to become the largest deficit country

Relying on high-tech industries, the rise of modern Britain, became the largest beneficiary of the industrial revolution after the country, from a small European countries jumped to become a world superpower. For this reason at its peak, a quarter of the world's land, occupied by Britain, and now many countries, were once colonized by Britain, ruling for decades to hundreds of years ranging. Nowadays, most of the countries colonized by Britain are poorer and basically not more developed than Britain. The only exception is a country, that is, Ireland, many people do not understand is, after Ireland's independence from Britain, what makes Ireland more developed than Britain? You may not think, mainly by four points.