Using All-time records
https://www.iaaf.org/records/toplists/sprints/100-metres/outdoor/men/senior/2017
100-Jamaica
200-USA (Jamaica has top 2, USA has #3-#8)
400-USA
800-Kenya
1500-Kenya
5000-Ethiopia (5 runners in top 7)
10000-Kenya
Marathon-Kenya/Ethiopia (had to include both-43 fastest all Kenyan or Ethiopian, 25 kenyan, 18 ethiopian)
Tell me your disagreements