Population Shifts Through Time

The population dynamics of major cities reveal dramatic shifts throughout history. Rome, once the largest city with a peak of 1.2 million, saw its population plummet to just 15,000 by the year 1000. As empires rose and fell, cities like Constantinople, Chang'an, Baghdad, and eventually London took turns holding the title of the world's largest city, with London reaching a staggering 7.5 million by 1925.