what would possibly exist in the farthest east?

[Zigûr]

Originally Posted by tom the eldest

the technology there would maybe be quite advanced,seeing that they had chariots,which the west NEVER used/invented.

On the contrary, I see the use of chariots by the Easterlings (and elephant cavalry by the Haradrim, incidentally) as evidence that their cultures were primitive, not advanced. Extensive use of chariots was characteristic of pre-Classical cultures like the Egyptians (among many others). The West had steel weapons and mail, advanced architectural techniques, naval technology etc and a generally more early-medieval flavour.

I have always seen the Easterlings' use of chariots as evidence that their development was "held back" by their long history as thralls to the Shadow.