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UNITED STATES - JANUARY 01: Control Of Mexican Immigrants To The American Frontier, 1950S (Photo by Keystone-France/Gamma-Keystone via Getty Images)

UNITED STATES - JANUARY 01:  Control Of Mexican Immigrants To The American Frontier, 1950S  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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An Italian delicatessen in the town of Bedford, home to a growing community of Italian immigrants, 24th September 1955. Original Publication : Picture Post - 8001 - Plight Of A New Little Italy - pub. 1955 (Photo by Bert Hardy/Picture Post/Hulton Archive/Getty Images)

An Italian delicatessen in the town of Bedford, home to a growing community of Italian immigrants, 24th September 1955. Original Publication : Picture Post - 8001 - Plight Of A New Little Italy - pub. 1955 (Photo by Bert Hardy/Picture Post/Hulton Archive/Getty Images)

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A luggage rack on Ellis Island, New York City, storing immigrants' suitcases, 1950. (Photo by Erika Stone/Getty Images)

A luggage rack on Ellis Island, New York City, storing immigrants' suitcases, 1950.  (Photo by Erika Stone/Getty Images)

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Young refugee boy arrives in New York Harbor.

Young refugee boy arrives in New York Harbor.

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circa 1950: Some of the 30,000 former displaced persons who were covered by blanket allowances of the Christian World Service organisation for eventual entry and American citizenship. (Photo by Douglas Grundy/Three Lions/Getty Images)

circa 1950:  Some of the 30,000 former displaced persons who were covered by blanket allowances of the Christian World Service organisation for eventual entry and American citizenship.  (Photo by Douglas Grundy/Three Lions/Getty Images)