Umayyads
1) the Umayyads built the dome of the rock.
2) They set up an international postal system using riders on horseback.
3) they started the first Arabic coinage of gold dinars and silver Dirhams.
4) the Umayyads were great builders, they built public buildings such as hospitals and mosques.
Abbasids
1) they introduced Persian art, literature, philosophy and medicine into the Islamic world.
2) they developed a large and famous university called Bayt AL-Hikmah which meant house of wisdom. scholars traveled from far areas to study here.
3) they developed a new profession; banking.
A major problem that the Abbasids faced was a medical condition called E.D (Erectical Disfunction) thus they couldn't reproduced and had low populations.
The Umayyads established the Umayyad Caliphate, the second of the four major Arab caliphates established after the death of Muhammad.
Evolution of paired limbs was one of major developments . Similarly development of jaws , Amnion etc are also major developments .
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Pennsylvania.
Railroads
the American revolution
He discovered the Americas.
watergate scandal
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It caused land devestation. Major destruction occured.