Do you think the development of writing was important to
the success of Sumer as a civilization?

Yes

Explanation:

The increasingly sophisticated system of writing that developed also helped the civilization develop further, facilitating the management of complex commercial, religious, political, and military systems. The earliest known writing originated with the Sumerians about 5500 years ago.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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c.) the country needed a stronger central government.