I'm ethnically European, so my ancestors shared the same race and values as the demography of the United States at the time. More so, the country at that time did not strive to provide government funded food, shelter, or healthcare, so no financial burden was required to support them.
I don't think it would have benefited, say, Israel or Japan to have extended my ancestors citizenship.
Did any of your ancestors, at any point, belong to a group of immigrants that was considered by a portion of the US populace as "undesirable", but were let in nonetheless?
Would you consider your own presence in the United States as a benefit of such immigration which took place a while back?