Socialism: Socialism was getting exposure at this time. Writers such as Louis Blanc, Proudon and Marx were all publishing their writings.
They gained control over many byzantine trade routes. The first is your answer
Having a weak government can lead to failure of a country
Explanation:
Although he had been tempted to build his capital on the site of ancient Troy, Constantine decided it was best to locate his new city at the site of old Byzantium, claiming it to be a New Rome (Nova Roma). The city had several advantages. It was closer to the geographic center of the Empire..