 Because of the diversity of Mexico and the influx of immigrants from almost every region in the country, there are no accurate estimates on ethnicity or race of the current population.The heavy influx of immigrants to the city and municipality of Tijuana has led to job creation in the form of over 700 twin-plant (maquiladora) factories, which serve as the basis of employment for the majority of the working-class people in northern Mexico.The high poverty level in Tijuana is attributed to the city's "magnet status" for people who have come from the poorer south of the nation and citizens from other nations seeking to escape from extreme poverty.