Historians consider the greatest achievement of the Byzantine Empire to be the preservation of Greek and Roman cultures Because
Greek and Roman literature, arts, mathematics, engineering, etc. has
been preserved by the Byzantine Empire, people were able to have access
to the information and ideas that the Greeks and Romans produced which helps modern mathematicians and engineers to this day. I hope it helped
Using the United States and Japan as an example, one prominent similarity would be that both countries practice the economic system of capitalism, while a major difference would be that the United States is a heavy exporter while Japan in a heavy importer.