Fresh from its victories in the Second Punic War, the Roman Republic continued its expansion in the western Mediterranean, campaigning in the Iberian Peninsula throughout the century and annexing the North African coast after the destruction of the city of Carthage at the end of the Third Punic War.The end of the century witnessed the evolution of the Roman army from a citizen army into a voluntary professional force, which later scholars would misattribute to putative reforms by noted general and statesman Gaius Marius (the so-called Marian Reforms).The Han Empire extended its boundaries from Korea in the east to Vietnam in the South to the borders of modern-day Kazakhstan in the west.Han efforts to find allies against the Xiongnu by exploring the lands to their west would ultimately lead to the opening of the Silk Road.The Greco-Bactrians crossed the Hindu Kush and established the Indo-Greek Kingdom, but lost their homeland in Bactria to the Sakas, themselves under pressure from the Yuezhi.
Map of the world in 100 BC, the end of the second century BC.