To say that credit cards are popular is an understatement. The overwhelming majority of Americans — 82% — have at least one credit card, though millions of people juggle multiple cards. According to Experian, Americans have an average of 3.84 cards and an average credit card balance of $6,365 per person as of 2023. But when were credit cards invented? Credit cards have a lengthy history, and they've changed quite a bit since their introduction in the early 1900s. When were credit cards invented? A timel ...