Why did so many Irish immigrants come to the united states between the 1840's and 1860's?

ANSWER:  In the mid-1840s, the size and nature of Irish immigration changed drastically. The potato blight which destroyed the staple of the Irish diet produced famine. Hundreds of thousands of peasants were driven from their cottages and forced to emigrate -- most often to North America.

Explanation: Pushed out of Ireland by religious conflicts, lack of political autonomy and dire economic conditions, these immigrants, who were often called "Scotch-Irish," were pulled to America by the promise of land ownership and greater religious freedom. Many Scotch-Irish immigrants were educated, skilled workers.

The potato blight which destroyed the staple of the Irish diet produced famine. Hundreds of thousands of peasants were driven from their cottages and forced to emigrate.

biological/genetic factors means they were born or predisposed to have something. nothing can really change it, and you can't really do much to "fix" it. it isn't something learned

these are the biological factors:

adrian is relatively tall and he is on the basketball team

(adrian can't ever stop being tall or force himself to be tall. likely one or both of his parents are tall as well and they passed on the tall gene. he probably does basketball because he is tall)

the rest are environmental/cultural factors. these are things that are taught to us. for example, cynthia wasn't born saving pocket money, her family most likely taught her this (environmental factor)

hope this !