Every country on earth exists because some people at some point banged whoever was there first over the head and took it from them. That's just life for violent Homo sapiens.
I'd be less worried about killing indians over 100 years ago than being an ally of nazi germany 70 years ago—the total death toll of native americans in the USA was only in the thousands, horrible as even that was (the bulk of deaths in the Americas (millions) happened from disease shortly after the Scandinavians and Spanish arrived). That said, both are not relevant to modern history, they are for this conversation "ancient history" with nothing to do with modern people.
As for Christianity in the US, that's true, but again, it is not mandated by the state, and every single time someone brings up even ridiculous claims of the state adopting religion, it gets struck down (the state religious stuff). Every time.
As an aside, examples from here in New Mexico are town seals (the town "logo") that have crosses on them—many dating back hundreds of years to the Spaniards. The funny one is for the town of Las Cruces (the crosses). It has crosses, lol. They want the crosses removed, but apparently not the NAME, heheh. If it goes to the State supreme court, it will be tried in our capital, Santa Fe (Holy Faith). Santa Fe is in the foothills of the Sangre de Christo mountains. LOL. Some stuff is just historical, and they (atheists) need to chill out (and I'm an atheist, myself).
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