What are the most significant achievements of early Islamic Civilizations?

many forms of art, algebra, calculus, geometry, chemistry, biology, medicine, and astronomy.

Dams, reservoirs, water wheel, and aqueducts.

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

the roman army grew in size and became dominant in the mediterranean region.