https://www.historyhit.com/divorce-and-decline-the-division-of-east-and-west-roman-empires/ - HistoryHit article covering the split of the Roman Empire and the eventual downfall of the empires.
https://www.britannica.com/place/Roman-Republic - This page from the Encyclopedia Britannica gives a basic background of the foundations of the Roman Republic, territorial expansion, the Punic Wars, and more.
https://www.youtube.com/watch?v=Y33LnxG2L80 – Khan Academy video about the rise of Augustus in the Roman Empire.
https://www.youtube.com/watch?v=w5zYpWcz1-E - Time-lapse video showing the expansion and shrinkage of the Roman Empire. It shows the year, capital location,