"Why did the civilizations of Sumer and Egypt not last? What could they have done better to last longer?" please i need help

They weren't strong enough to fend off hunger and attackers.

Explanation:

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

the virginia plan called for three branches of government and two houses of congress. representation in each house would be determined by population. the new jersey plan called for three branches of government and a single house of congress. each state would have an equal vote.