Did you guys know, ancient Ukrainians had a practice where they would burn down their cities every 60 to 80 years? It t is called the Burned House Horizon and remains unexplained.

Apparently ancient Ukrainians, in Trypillian times, had a practice called "Burned House Horizon" where they would burn down their houses and destroy their settlements every 60 years and then rebuild them.
I think this practice may be why Ukrainians did not become as important in Europe as other countries. Apparently no one can explain this practice.