>>17935459 (OP)
1. Rome became Christian
2. Constantine used Germans as foederati when past times they were always unreliable
3. He elevated Germans to magister militium particularly the franks
4. Frankish generals defeated the goths in 380 but never bothered exterminated the remainder that hid out in Bulgaria
5. Frankish generals signed a truce with them that gave them many concessions
6. Goths with their concessions were free to stay in assigned land together
7. This led to gothic rebellions
8. This led to gothic invasion of Rome in 410
9. Gothic general led the Roman fleet to try and recapture Africa in 468, he failed out of low iq or betrayed the Romans for his ethnic relatives the vandals
There you go. Rome was at the cusp of the Industrial Revolution even in the 4th century. Never trust a German, NEVER.