i don't know tell you the truth
The Sumerians obtained most of their wealth and success from trade.
Oil
nothing
For most of English history it was agriculture: for much of the 19th century it was industry; now it's services - a fairly routine progression, but Britain was one of the first countries to experience it.
Gold & Limestone they also relied on agricultural communties , livestock & fish
It helped the kush's economy grow
meroe was in a good location because it was near natural gold.
trade
cats
gold
Trade.
Well, I'm not totally sure, but in my Geography book, it says its main source of wealth is Petroleum.
Agriculture
P. Diddy's wealth comes from his clothing line (Sean John)
phosphates.
Mining
Dubai