Millions of Nigerians have emigrated during times of economic hardship, primarily to Europe, North America and Australia. It is estimated that over a million Nigerians have emigrated to the United States and constitute the Nigerian American populace. Individuals in many such Diasporic communities have joined the "Egbe Omo Yoruba" society, a national association of Yoruba descendants in North America. Nigeria's largest city is Lagos. Lagos has grown from about 300,000 in 1950 to an estimated 13.4 million in 2017.