Sumer is important in the world history because it was considered the creators of civilization to modern humans. The name Sumer comes from Akkadian, the language of north Mesopotamia, which means “land of the civilized kings”.
Moreover, Sumer is known for their innovations in language, architecture and governance that resulted to an established order in the region and began the world civilization.
The answer is A.
If political factors make petroleum expensive or impossible to obtain, the use of shale oil might increase.
Answer:
People would describe something without value as a "not worth a continental" because they would think that if it didn't have value then nobody is going to want it, And if it were a merchant or a seller it would get no sales so it would become useless and a "not worth continental."
answer A the availability of raw materials
One party systems is correct