Which of these geographic factors contributed to the decline of sumer?
it was located on the persian gulf.
the tigris and euphrates rivers flooded every year, leaving behind dark, fertile soil.
sumer was located on a flat plain that provided no natural barriers to invasion.
mountains made agriculture difficult.

the cultivated soil had poor drainage, grain fields of one city-state bordered those of another which caused territorial wars. irrigation of the crops led to salty soil.there was lack of natural barriers that could discourage attack

i would say c.

hope this xddd

the correct answers are: 1) lay and collect taxes and duties; 2) pay debts; 5) borrow money;   6) regulate commerce with foreign nations.

article 1, section 8. refers to the powers of congress. according to the united states constitution: “the congress shall have the power to lay and collect taxes, duties, imposts, and excises, to pay the debts and provide for the common defense and general welfare of the united states.”