And just to illustrate my point that it wasn't all mad craic and parties, heres a couple of choice samples of what the Irish faced in the 'States and in the UK, 

[spoilered for images, just google "No Irish Need Apply" or "No Blacks No Dogs No Irish"
[hider]
[img]https://i.guim.co.uk/img/static/sys-images/Guardian/Pix/pictures/2015/10/21/1445446357535/Sign-in-London-reading-No-009.jpg?w=620&q=55&auto=format&usm=12&fit=max&s=9fdd1d3a4ee91c241eaa0622e74174fa[/img]
[img]http://1.bp.blogspot.com/_azWmV5p47Rs/SDmPVeRQFQI/AAAAAAAAAio/hdxZIb6jplg/s1600/no%2Birish%2Bno%2Bblacks.jpg[/img]
[img]http://wyblog.us/images/no-irish-need-apply-sign.jpg
[/img]
[img]http://media.irishcentral.com/images/1-sarah-dropkickmurphys-image-noirishneedapply-e1418411853120.jpg[/img]
[img]http://the-american-catholic.com/wp-content/uploads/2015/08/no-irish-need-apply-daily-republican-il-7-may-1873.bmp[/img]
[img]https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/NINA-nyt.JPG/300px-NINA-nyt.JPG[/img]

[img]https://yesteryearsnews.files.wordpress.com/2011/03/no-irish-need-apply-new-york-daily-times-25-mar-1854.jpg[/img]
[img]https://static01.nyt.com/images/2015/09/08/insider/irish1/irish1-jumbo.png[/img]
[img]http://www.noirishneedapply.net/wp-content/uploads/2015/03/ninasong1-600x400.png[/img][/hider]