I dont think any alternatives would work. Whether you have a race, a game, whatever, if a country that loses thinks their army could beat the country who won, they'll just go to war over it. If there was an alternative then it would have to be something where less people die, but the losers can't do anything about it. So far giant robot battles sound the most logical(that sentence sounds wierd) Since the winners would have giant robots to keep the other countries in line and the losers' giant robots would be destroyed.