The history of netball can be traced to the early development of basketball. A year after basketball was invented in 1891, the sport was modified for women to accommodate social conventions regarding their participation in sport, giving rise to women's basketball. Variations of women's basketball arose across the United States and in England. At a physical training college in England, the rules of women's basketball were modified over several years to form an entirely new sport: "net ball". The first codified rules of netball were published at the start of the twentieth century, and from there the new sport spread throughout the British Empire.