
This city ruled 20% of humanity
Ancient Rome began as a settlement beside the Tiber River, traditionally dated to 753 BC. At its height in 117 CE, it ruled about 5 million square kilometres and an estimated 50 to 90 million people.Ancient Rome: How a City Ruled the Mediterranean

It did not conquer by force alone
Rome expanded through treaties and military strength, then absorbed Etruscan culture and the Greek culture of southern Italy. A riverside town became the dominant power around the Mediterranean Sea.Ancient Rome: How a City Ruled the Mediterranean