He reformed the taxes, the law into codex justinianus which is used today and he conquered part of the west back.
The Justinian
Code was created in order to create one single set of laws for all of the
Byzantine Empire. This code was extremely important because it served as the
basis for everyday actions within the empire including marriage, criminal
justice, slavery, and property rights. Along with this, the code ended up
serving as the basis for the laws of the Byzantine Empire for the next 900
years. Countries all over world use ideas from Justinian Code's in order to
form a comprehensive set of laws. The four sections of the code are the Codex
Constitutionum, Digesta, Institutiones, and the Novella Constitutiones Post
Codicem.
The regions were sucked up into the conflict and into numerous proxy wars. The region alignment was of major concern to the two powers each competing to check each other powers in the region and extend its interests. The middle east became more important because of its rich oil fields.
The last one and the 3 one is the second one suppose to be American and u misspelled it? If its not American then no so just the last one and 3rd one. Hope this helps if not comment back I’ll get a notification and I will reply to help you figure it out
