Which common factor allowed both the Macedonian Empire under Alexander the Great and the Roman Empire to expand?

Derek is working on a thesis on the changes in social behavior in the context of finding partners. an important part of his study concerns the various practices followed by males and females over the course of generations and how they have gradually transformed into our current social norms. derek can be called a(n) psychologist. (tb75)\

President franklin roosevelt most likely supported lawrence camp in the senate race against walter george and eugenes homage in 1938 because he

"people are the greatest resource that a country has". justify.