Genealogy Graph

Why was there such a big drop in Irish immigrants?
from about 1853 to about 1855 after the potato blight? Here is the graph were i got the information from::
http://freepages.genealogy.rootsweb.ancestry.com/~dgarvey/Garvey_us_census/Irish_to_US.jpg
Thanks!
Type “No Irish need apply” into google or any other search engine, you will see why they stopped coming. I would try to explain everything to you here but it would just become a long rant.
Interactive Visualization of Genealogical Graphs
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