Its population has increased
Slavery and the start up of the government
Rome was not a good place for the capital because it was difficult to manage all the regions, and to defend against the barbarian invasions. So, for question number 3, the right answer is a, because Constantinople had a better strategic position and could stop the barbarian invasions.
For question number 4, the Byzantine empire kept using the Roman law system, but it had a Christian influenced.
For question number 5, the Eastern Roman Empire had many major achievements, but of the greatest is the arrangement of Roman law in an orderly form. The Roman law was codified by Justinian I in the 6th century and it’s known as the Justinian’s legal code. This legal code has been used as the base of multiple Western countries' legal codes and it’s still relevant nowadays.
The conjugation of the verb "design" to "designed", without any auxiliary verb such as "have" or "do", shows the use of the 'simple past" tense (also known as preterite), whose principal function is to place a completed action or situation in a moment before "now".
What tense is the underlined verb in the sentence? The architect designed a daring structure.
D. Past
It did not lead to the Civil War, what led to the civil war was the war of 1812. That was when U.S.A recognized that it needed to become stronger, and slaves were transported to the United States and put in the working class under bad conditions. Child labor and prejudice began there as well.