Christianity 1 Emigration and immigration 1 History 1 Irish monks 1 Migration, immigration & emigration 1 Modern history to 20th century: c 1700 to c 1900 1 Religious aspects 1 churches 1 clergy 1 clerical advice-giving 1 emigrant welfare 1 faith 1 mass emigration 1 nineteenth-century Ireland 1 parish clergymen 1 religious change 1