A Historian's Note: From Republic to Empire to Fall
1Rome grew large while it was still a republic. By about 264 BCE it controlled most of Italy. In three wars with Carthage, called the Punic Wars, Rome won Sicily, Spain and North Africa, and in 146 BCE it also destroyed Corinth in Greece. Ruling so much land took large armies, and in the first century BCE generals whose soldiers were loyal to them more than to the senate fought civil wars.
2Augustus, called Octavian before 27 BCE, kept the senate, the consuls and elections. But he commanded most of the legions, governed the provinces where they were stationed, and held the powers of a tribune for life, which let him propose laws and block the acts of other officials. The emperors after him held these powers too.
3Roman roads, first built to move armies, came to stretch for tens of thousands of kilometers. Aqueducts carried fresh water into cities but needed constant repair. Roman legal writers held that the person who makes a charge must prove it, not the person who denies it, an idea behind today's rule that an accused person is innocent until proven guilty.
4In 376 CE, Goths fleeing the Huns crossed the Danube River into the empire, and in 378 they defeated a Roman army at Adrianople and killed the emperor Valens. Over the following decades the Western Empire relied more and more on Germanic soldiers. In 439 the Vandals captured Carthage, the center of rich farmlands that sent grain and taxes to Rome. In 476 a Germanic general removed the last western emperor, while the eastern half of the empire continued.