Irish slaves in the Americas - a part of history we don't hear about in school

http://yournewswire.com/the-irish-slaves-what-they-will-never-tell-you-in-history/

My Mom had mentioned about Black Irish but it was in relation to survivors from the wrecks of the Spanish Armada washing ashore and being welcomed into the Irish population.
Don't know if that's true.
That's not what this is.