How did Romes political influence expand as it conquered new territories?
In the territories which were annexed, Rome was in charge. The provinces of the empire were administered by provincial governors. The local elites were allowed to run local affairs following local laws, customs and religions. Roman law regulated the affairs between Romans and locals. The governors acted as chief justices.. In the states which were allies or client states of Rome, the Romans intervened when there was political instability. The Romans built Roman towns around the empire to settle discharged veterans. These ex soldiers often married local women and played an important part in the spread of Roman influence. In the western provinces the Romans often linked aspects of their divinities with aspects of local divinities. Infrastructure projects (roads, bridges, aqueducts, baths, theatres, amphitheatres) and the thriving trading networks of the empire also played a part. Imperial propaganda was another factor.
Ghana gain its wealth through trade. Traders that traveled through its territories had to pay taxes for the goods they sold. Ghana made its fortune in Africa. They used it to expand their army's and to expand the kingdom. The armies conquered neighboring lands and brought more and more wealth to the kingdom.
Throughout its history, Japan's geography has played a significant role in its effort to expand imperially. Especially in modern times, Japan's status as an island required that it develop merchant and naval forces. The lack of natural resources, such as oil, in its home territories also motivated Japan to expand at the expense of nations in its sphere of influence.
Alexander the Great spread Hellenism, the Hellenic (Greek) culture of the Macedonians, to all the lands he conquered, over the Middle East and far into Asia. After his death in 323 BCE, the influence of Greek civilization continued to expand over the Mediterranean world and West Asia. This was known as the Hellenistic Era.