Final answer:
London, England would be a strong candidate for NFL expansion into a European country due to its history of hosting NFL games and an existing fan base. However, other cities like Berlin, Paris, and Barcelona also offer compelling reasons for consideration, such as vibrant sports cultures and infrastructure that could support an NFL team.
Step-by-step explanation:
The question of where the National Football League (NFL) should expand if it were to choose a European country is speculative and would involve many factors including market potential, existing sports culture, and infrastructure. If the NFL were to consider expansion into Europe, London, England might be the most likely choice given its history of hosting NFL games and the existing fan base there. Games have been played at Wembley and Tottenham Hotspur Stadiums, indicating the city's capacity to host large sporting events. Other cities like Berlin, Paris, and Barcelona also present strong arguments with vibrant cultural scenes and sporting enthusiasm. Berlin has a passionate sports fan base and a history of American football interest, while Paris is a central European location with considerable international appeal, and Barcelona boasts a deep-rooted sports culture with facilities that could potentially host an NFL team.