Afghan immigrants working at a brick kiln in Pakdasht, Iran. Millions of undocumented Afghans live in Iran.Credit...Fatemeh Bahrami/Anadolu Agency, via Getty Images BAMIAN, Afghanistan — War and poverty have scattered Afghans across the globe like pieces of shrapnel. Millions of Afghans came of age in refugee camps in Pakistan and Iran or as workers in the Persian Gulf nations. The migration conti