Agriculture and specialization made it possible for humans to give up their nomadic lifestyle and settle in one place. This will eventually lead to making a civilization.
It began in the 1880s but started in the United States and England around 1920s
On April 6, 1896, the first modern Olympic Games are held in Athens, Greece, with athletes from 14 countries participating. The International Olympic Committee met for the first time in Paris in June 1984 and chose Greece as the site of the inaugural modern Olympiad.
I believe that it tells you their rules and revelations between each others . How all countries combine .
