Why do you think the eastern half of the empire survived

Because of the organization and capable leadership of the empire.

Explanation:

Byzantium did not survive by "mere luck." Byzantium has maintained thanks to capable leaders, an organization, skilled diplomats and an excellent military organization. True, he did not possess "that splendour" as the Western Roman Empire at its height, but it is wrong to think that thanks to luck, the empire was maintained for almost a thousand years after the fall of the Western Roman Empire. The great French Byzantologist and historian Charles Diehl says "The Byzantine Empire was a captive of Christianity in the east, against the unbelievers it saved Europe in a few moments by its inferiority, in the Middle Ages ".

it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.