Mass migration to the US ended in 1931 but American and Irish consuls continued to engage with the process of transatlantic departure and arrival and it involved diplomacy. This chapter examines the trends in emigration and immigration against the context of the unfolding depression and increasingly restrictive legislation and its impact on the respective societies. It suggests that both governments shared the same intention to close their borders to certain categories of immigrants. The pattern of migration work, therefore, changed and focused mainly on the needs of the settled immigrant in Ireland and the US. The consequences of social mobility and ethnic assimilation are investigated through the financial and legal aspects of consular work. Regardless of economic conditions, the movement of peoples and monies across the Atlantic continued to give substance to the different phase of transatlantic migrant ties in the 1930s