In which country is there evidence of the earliest form of football (soccer)?

Association football, more commonly known as football or soccer, is a team sport played with a spherical ball between two teams of eleven players. It is played by 250 million players in over 200 countries and dependencies, making it the world's most popular sport. The game is played on a rectangular field called a pitch with a goal at each end. The object of the game is to score by moving the ball beyond the goal line into the opposing goal.

According to FIFA (Fédération Internationale de Football Association), the Chinese competitive game cuju (literally "kick ball") is the earliest form of football for which there is evidence. Cuju players could use any part of the body apart from hands and the intent was kicking a ball through an opening into a net. It was remarkably similar to modern football, though similarities to rugby occurred. During the Han Dynasty (206 BC – 220 AD), cuju games were standardised and rules were established.