What caused the fall of the Irish population in the 19th century?

What caused the fall of the Irish population in the 19th century?

The population of Ireland collapsed dramatically during the second half of the 19th century. A population of over 8 million in 1841 was reduced to slightly more than 4 million by 1921. In part, the fall in population was due to death from the Great Famine of 1845 to 1852, which took about 1 million lives. However, by far the greater cause of population decline was the dire economic state of the country which led to an entrenched culture of emigration lasting until the 21st century.