Are US natural citizens denied the ability to get a foreign citizenship?

There are many countries that don't require a pledge of allegiance for citizenship, so you can't really argue that being a citizen of those countries constitutes a conflict of interest with US citizenship.

Being a citizen of a country typically means that you have certain rights and privileges in that country that non-citizens don't. That's about it. "Loyalty" doesn't enter the picture unless one is a hardcore nationalist.

Choose who to love; Your father ... or your mother. Your father's uncle, but not your mum's brother

Nah, I don't buy the idea, Is plain BS.