Immigrants from Ireland and Germany arrived in St. Louis in significant numbers starting in the 1840s, and the population of St. Louis grew from less than 20,000 in 1840, to 77,860 in 1850, to more than 160,000 by 1860.
Os inmigrantes de Irlanda e Alemaña chegaron a St. Louis en masa a partir da década de 1840, e a población da cidade medrou de menos de 20 000 en 1840 a 77 860 en 1850, e a máis de 160 000 en 1860.