People who take an Oath of Allegiance to the United States must renounce, or give up, allegiance to all other countries. Why do you think this is so?

It signifies the end of the immigrant experience and is the final threshold before one's acceptance as a citizen. ... The oath requires the intending citizen to “absolutely and entirely renounce and abjure all allegiance” to any country that he or she has been a citizen

Explanation:"I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America"

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.