the case of india in they brought the culture that exist to this day
Hitites becoming with egypt the superpower of the bronze age ,were the one who developed iron metalurgy
Afadanievo and tocharians were the ones who spread metalurgy, chariots , horses, apiculture…that would china let start their first civilization
Scythians becoming the kings of the steppe teaching finno ugrics and mongols the way of life of the steppe
In the new kingdom time in egypt all pharaoh are redhead r1b is the moment of maximun expansion and prosperity in the history of egypt
Dorians invasions was the ones who brought greek language and is the moment of the start of tje greek golden age
Romans were the only latin ( indo european ) tribe in north cwntral italy they conquered all their neighbour to built one of the most powerfull empires of history
Iran foundation and posterior spread all around the middle easr due to another aryan tribe sintashta
The only ones we are not sure are sumerians but looking at their blue eyes statues, swastikas in their ceremonial bowl , h5 european mrd dna in the female samples everything point to be a mix of eastern hunter gatherers that descended from the steppe and mixed with iranian farmers
Aryans literally built the ancient world