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In page Irish diaspora:

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Walker (2007) compares Irish immigrant communities in the United States, Australia, New Zealand, Canada, and Great Britain respecting issues of identity and 'Irishness.' Religion remained the major cause of differentiation in all Irish diaspora communities and had the greatest impact on identity, followed by the nature and difficulty of socio-economic conditions faced in each new country and the strength of continued social and political links of Irish immigrants and their descendants with Ireland.[citation needed]