Leaving aside any factors beyond this world, the pinnacle of human technology in this world lies in the Mei Country.
Because any advanced technology in this world was reverse-engineered from Transformers—primarily Megatron.
Megatron crashed down to the Arctic from the sky. Since Cybertron has no ice and the temperature is far higher than the Arctic's, the big guy didn't react in time and got frozen.
Humans used cryotechnology to freeze him until modern times, continuously researching the components on his body. This is the source of modern technology in this world.
So although things look the same, in essence, there are some differences.
Mainly in material strength and construction, such as various alloys.
Besides that, there are devices utilizing thermal energy.
The thermal efficiency of this world's machines is incredible, far surpassing the internal combustion engines of the same period from their inception, not to mention the modern vehicles.
