If rome had no master plan for expansion, why did it expand ?

Romans expanded as they came with conflicts with its surrounding neighbours.

Explanation:

The Romans did not set out any plan to build an empire. Instead, they expanded as it came into conflict with neighbouring city-states, kingdoms, and empires. By engaging in fights, they include these new territories and populations as their own. The more powerful and prosperous the Romans became, they further expand their empire. The Romans were not content with their small state in Italy. Romans were able to gain victories because of the discipline and training of soldiers who developed as the best fighters in its period. Rome territorial conquest in Italy led them to declare Latin as an official language.