What were the major changes to the roman political empire?

The Roman Republic went through many changes as it evolved into the Roman Empire. One of the most drastic changes was caused by Gaius Marius who was elected as consul for several years. He also began recruiting poor citizens in exchange for land. The next major change came from Lucius Cornelius Sulla who was consul after Marius. He took all political power from the Tribunes and the people and became a dictator. The final major change to the Roman political empire was caused by Julius Caesar, he conquered all of Tome and created a dictatorship. He then expanded the Roman Empire further than the boundaries had even been before.