Inmigration: The potato famine

Here you can see a video related to the Selectividad text that we saw in class the other day. Have a look at it and try to answer the next questions. You can use the Internet to get the asnwer.

Research questions: 
a) Where did the potato come from and how did it get to Ireland? 
b) What does the potato famine have to do with immigration? 
c) Where did many Irish emmigrate to? 
d) Who was Sir Walter Raleigh?