What were the achievements of the maya and the aztec civilizations

the ancient maya. mayan civilization lasted for more than 2,000 years, but the period from about 300 a.d. to 900 a.d., known as the classic period, was its heyday. during that time, the maya developed a complex understanding of astronomy.

- 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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it the big letter b heart my answer