It used to be that a driver's license was the ultimate identification; indeed, it, your birth certificate, Social Security card, and voter registration card were the main ones.
But there also were the library and insurance cards and every club you joined issued a card whether or not you used it. The stack grew larger.
Take some time today and count how many passwords you use. I have pages of them and the suckers keep changing for security reasons.
A few months ago I found an old postcard addressed to my great aunt in Glendale, Arizona. All it had for an address was her name and city. It somehow got to her.
They knew who she was.