Where did we come from? And what brought us here? From the early wanderings of Homo erectus out of Africa 50,000 years ago to modern refugee migrations, the mass movements of humanity change the entire world. Profusely illustrated with color photographs and artwork, this wide-ranging overview discusses dozens of momentous cultural upheavals, including the crossing of the Bering land bridge, Celtic expansion in Europe, the Arab conquest of Spain, the Middle Passage, the Trail of Tears, the California Gold Rush, and Britain's "Windrush" generation.