During the American War of Independence the reins were loosened a little. Further concessions had to be granted during the French Revolution. Ireland rose so quickly that her people threatened to outstrip the English. The English government drove them to rebellion and achieved the Union [390] by bribery. The Union delivered the death blow to reviving Irish industry. On one occasion Meagher said: all Irish branches of industry have been destroyed, all we have been left is the making of coffins. It became a vital necessity to have land; the big landowners leased their lands to speculators; land passed through four or five lease stages before it reached the peasant, and this made prices disproportionately high. The agrarian population lived on potatoes and water; wheat and meat were sent to England; the rent was eaten up in London, Paris and Florence. In 1836, £7,000,000 was sent abroad to absent landowners. Fertilisers were exported with the produce and rent, and the soil was exhausted. Famine often set in here and there, and owing to the potato blight there was a general famine in 1846. A million people starved to death. The potato blight resulted from the exhaustion of the soil, it was a product of English rule.

Through the repeal of the Corn Laws Ireland lost her monopoly position on the English market, the old rent could no longer be paid. High prices of meat and the bankruptcy of the remaining small landowners further contributed to the eviction of the small peasants and the transformation of their land into sheep pastures. Over half a million acres of arable land have not been tilled since 1860. The yield per acre has dropped: oats by 16 per cent, flax by 36 per cent, potatoes by 50 per cent. At present only oats are cultivated for the English market, and wheat is imported.

With the exhaustion of the soil, the population has deteriorated physically. There has been an absolute increase in the number of lame, blind, deaf and dumb, and insane in the decreasing population.

Over 1,100,000 people have been replaced by 9,600,000 sheep. This is a thing unheard of in Europe. The Russians replace evicted Poles with Russians, not with sheep. Only under the Mongols in China was there once a discussion whether towns should be destroyed to make room for sheep.

-- International Workingmen’s Association 1867 Record of Speech by Karl Marx

honestly I just read it as Irish people liking potatoes, similar to the stereotype that Germans like sauerkraut

Racism was the cause.