Much of the very early migration had been heavily male, but during the famine years, migration was largely a family affair. Families were arriving serially in "chain" migration while others suffered high mortality rates in these years. The Irish were the first to practice "chain or serial migration" on a large scale. During the famine years males still outnumbered women in migration numbers but not by a large margin. However in the post famine years and especially after 1880 more women came from Ireland than males. The reason for this was that women were always more deprived of work than men in Ireland, and in the post-famine years the position of women got exponentially worse. In Ireland, contrary to what was happening in the United States, women did not live longer than men. The lives of immigrant Irish women were not easy, but much better than a life back in Ireland. In the 1850 's through the 1870 's 45% of all Irish immigrants were persons in the 15-24 age group with gender evenly balanced. But in the 1880 's to 1920 that same age group made up about 60% of all Irish immigrants. This social class was young and could adapt to working in the harsh conditions. Immigrants who arrived alone often eventually married either someone from the immigrant community in the area. With each passing year women began taking up a higher and higher percentage of Irish immigrants. By 1921 women outnumbered men 2:1. These women were overwhelmingly concentrated in domestic service. At the turn of the
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