The short answer? Not enough. I'm just not sure how well that can translate into action.
Consider the things some of my ancestors have in common. A country was basically sold to a foreign nation that proceeded to force its ways onto the people. It tried to suppress native music, dance, and dress. It almost succeeded in eliminating the native language. It persecuted people for not adopting the new religion. It developed a system of land ownership and management that caused widespread famine and drove millions of people not just from their land, but out of the country entirely.
The things England would need to do to make up for what it did to Ireland boggle my mind, and even I, a descendant of coffin ship refugees, would find it unreasonable to ask for more than an end to discrimination against the Irish.
However, I do think there is more that can be done for the Native American populations. I am not talking about monetary reparations, because no amount of money can pay for what's happened. We should support tribal economies, of course. But we should also show greater respect for the ways and languages of the land.
If that "English only" movement took their own advice and learned the language of the land before immigrating here, we wouldn't be speaking English now, would we?