The main difference between European and American blackjack lies in how the dealer's cards are dealt. In European blackjack, the dealer only receives one card face up at the start, with the second card dealt after all players have completed their hands, while in American blackjack, the dealer is dealt two cards from the beginning, one face up and one face down. This changes the amount of information available to players when making decisions. Additionally, European blackjack typically has more restrictive rules, such as limiting doubling down to certain hands and not allowing surrender, while American blackjack offers more flexibility, including the possibility to double down on any two cards and the option to surrender in some games. Overall, these differences can slightly alter strategy and affect the game's pace and risk.