Soccer is the most popular sport because many different types of cultures endured it and made it what it is today. Many different types of cultures claim the invention of this game, going as far back as to the Romans playing the game with their enemies heads, but back then it was considered unofficial. The game was made official in the mid 19th century and ever since has been embraced by the world. Soccer is the most popular sport in the world because it was one of the first sports to ever be invented.