Alice, some of my Irish ancestors came to England from Galway and Westmeath between the 1840s and the 1900s. Some of them never had any land to be taken, not everyone can have the farm in a big family. Others were actively involved (as land agents) in evictions. Still other ancestors were English, but they weren't taking anyones land in Ireland; as Recusants they had enough on their hands trying to stay unnoticed by the law. Others still were soldiers and factory workers.

But the big difference between Ireland and the USA is that any attempts at genocide in Ireland were ineffective (not totally for lack of trying), whereas whole nations have disappeared in America, and were intended to.