Answer:
no potatoes were left
Explanation:
The Great Famine was the ruining of potato crop that feed most of the population with a blight (type of fungus). While Irish people did go to America to escape starvation, this doesn't increase American population, but instead increased the diversity levels in America.
If I am wrong, I am very sorry :'(
The answer of your question
Priests wanted to convert American Indians to Roman Catholicism. Other European nations sent explorers and settlers to the Americas. The Spanish wanted to stop these nations from claiming land.