Final answer:
Abram exited from Ur during the period of the Third Dynasty of Ur, when the city was sacked by foreign invaders.
Step-by-step explanation:
Abram, also known as Abraham, exited from Ur during the period of the Third Dynasty of Ur. The city of Ur, located in Mesopotamia, was the capital of an empire that stretched across southern Mesopotamia. However, due to raids and invasions by foreign groups such as the Amorites and Elamites, the empire eventually disintegrated. The city of Ur itself was sacked around 2004 BCE, which marked Abram's exit from Ur.