What is the time period called during which the surviving spouse of the insured does not receive social security income benefits?

Why have the aztec ruins in mexico city not been dug up?

How does désir represent the diversity of europe today? how did the 1400s and 1500s affect the religious diversity of europe? how might cultural diversity in a place like germany affect everyday life? what are two reasons some europeans might find immigration to be an advantage? what are two reasons some might find it to be a disadvantage? why do you think languages and culture spread more easily in europe now than in the past?

Which of the following items would serve as a primary source for a historian studiying the american civil war