Ignorance on the Sumerian civilization in the world wide reputation would come from many reasons. 
First of all, the public relation effect in Europe on the Rosetta Stone in 1799 by Napoleon troop must 
be noted as the faulty description of the history of ancient Sumerian to be a barbarian that was found on the 
description of awful boat of Egyptian king witten on the Stone has given a wrong image of Sumerian in the history of ancient records studied. 

 
Next misunderstanding has come from a racial problem which was introduced in the description made by 
the Sargon the First of Akkad city in 2350 BC or some forty five hundred years ago on the discriminating 
report telling that he who was high nose with white skin has defeated the enemy who was a round head in 
black hair and blown skin born.

 Third tragedy was the great fire of the library of Alexandria in 288 AD 
where some fifty thousand books written on papyruses for the ancient stories of Mesopotamia were lost 
in vain un recovered. 

 Forth difficulty has come from the recent two wars of Iran-Iraq conflicts 
and Iraq War. 
Although the archaeological studies in Mesopotamia in the half of twentieth century have  
to be postponed, we can expect after the Iraq war is terminated the continued survey by the German group on the ancient Sumerian activity 
that has been made in the northern Iraq studied. Archaeological study on the tribe of ancient Sumerian should be classified as the commercial and trade people. 
The classification in the agricultural people for Sumerian could be applicable after the age of some fifth millennium 
BC or seven thousand years ago approximately

 at which era the Sumerian in the northern hill had moved down 
Tigris river to the agricultural land cultivated. The typical study on the conflict introduced between the agricultural 
tribe against the hunting tribe which was represented by the Semites tribe of Sargon the First of Akkad city who 
defeated the Sumerian kingdom in 2350 BC or some forty five hundred years ago has been too much emphasized.     
The particular worship of Sumerians on their guardian God ENLIL must be referred carefully. As the major facility 
of ENLIL who has arranged the balance kept between three parties, or buyers, sellers and agents must be highly respected.
 
As the ancient Sumerians were successful in their trade business they would import their foods by paying 
out their profits to the surrounded countries of farmers 

, such as we will find in the case of nowadays Japan.