A massive immigration of Irish to the United States in the mid-19th century because of a failure of the Irish potato crop was most likely caused by what protist?

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The failure of the Irish potato crop was caused by a pathogenic protist called Phytophora infestans, also known as the potato blight. This led to a widespread famine in Ireland, forcing many Irish people to immigrate to the United States in search of better opportunities. Trichomonas vaginalis, Giardia lamblia, and Pfiesteria shumwayae are protists that can cause human diseases, while Plasmodium falciparum is the protist responsible for malaria.

A Massive Immigration of Irish to the United States in the Mid-19th