Question

How is this map different from a typical map of the united states?

Answer 1

The correct answer to this open question is the following.

The map is different from a typical map of the United States in that it is a cartoon, depicting the East Coast states of the country, but instead of having the correct US states names on it, it has the names of Irish provinces. Even the name of the Gulf of Mexico and the Atlantic Ocean have Irish names.

I have attached the image for better understanding.

Yes, the Irish Potatoe Famine was a reason for Irish people to emigrate to the United States and they were looking for jobs and better living conditions for their families. So American citizens saw this amount of Irish immigrants coming and feared that they would take many jobs that belonged to U.S. citizens.  

Answer 2

Based on the scenario you described, i think it's a projection of another timeline if we're not colonized by the British.
Something like : 'if ireland was the one that colonized Eastern north America instead of England'

hope this helps