I am somewhat amused, when people talk about "civilization", for as a child I lived through the wartime and immediate postwar period in Central Europe. So where was civilization or advanced technology? There was no electricity, no running water,  worthless and terribly inflated money, no industrial production, no gas, food produced  only by some farmers in the countryside, no trains, no bridges or usable roads, only private efforts to collect and bury dead bodies, clean up the rubble or defuse un-exploded bombs. People on the main city streets selling bread, bacon, pork lard, cigarettes, used clothes, firewood, accepting broken gold or jewellery as payment. I bet people in Africa had it far better, for when they got hungry, they simply tore off a banana from the next tree. Yes, we also had the conquering Soviet army  that took everything that was not nailed down and some  that was,  and took  our womenfolk for their amusement.