Cause of the great famine and its place in the demographic and migration history

In the 1800s, Ireland was essentially a rural country. its economy depended only on agriculture, and its industrial system was very weak. Therefore, Ireland was very poor compared with its neighbour, England. It is considered most of all as an island belonging to England and integrated by this fact into its economic system. its population was rural and its economy was late, although this country knew some progress in the last decades. It is in this specific context that in 1845, a terrible famine appeared that had dramatic consequences on the future of the country. But, why did Ireland suffer so much from this famine, while the other European countries that too were affected, were largely spared? What were the direct and indirect causes of the great famine in this country, and what consequences did it have on the demographic and migratory evolution of this country?