What was one consequence of roman expansion beginning in 300 bce?

Between 500 BC and 300 BC, the Republic saw its territory expand from central Italy to the entire Mediterranean world. In the next century, Rome grew to dominate North Africa, the Iberian Peninsula, Greece, and what is now southern France. During the last two centuries of the Roman Republic, it grew to dominate the rest of modern France, as well as much of the east.

The precise event which signalled the end of the Roman Republic and the transition into the Roman Empire is a matter of interpretation. Towards the end of the period a selection of Roman leaders came to so dominate the political arena that they exceeded the limitations of the Republic as a matter of course. Historians have variously proposed the appointment of Julius Caesar as perpetual dictator in 44 BC, the defeat of Mark Antony at the Battle of Actium in 31 BC, and the Roman Senate's grant of extraordinary powers to Octavian (Augustus) under the first settlement in 27 BC, as candidates for the defining pivotal event ending the Republic.

Many of Rome's legal and legislative structures can still be observed throughout Europe and the rest of the world by modern nation state and international organisations. The Romans' Latin language has influenced grammar and vocabulary across parts of Europe and the world. 

They most like influence us an there self