One important Sumerian contribution is .

A. The design of the arch
b. The design of the ziggurats
c. The mapping of Mesopotamia
d. The alphabet

What does the term “escalation” refer to?

Which lake receives up to 9 million visitors each year, covers more than 90,000 acres, and was created by denison dam? a. the grand lake o' the cherokees b. lake thunderbird c. lake eufaula d. lake texoma

What was a major failing of the united states government under the articles of confederation?