Boundary Line Change from Russia to Poland in 1920's
Although this is a geographical/historical question, I thought the people here might be knowledgeable.
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A person I am researching was born in 1884. In 1920, he answered the US census questions about origins that he was born in Russia, each parent born in Russia.
In 1930, with the instruction to give the name of the CURRENT country in which he was born, he answered: Poland, Poland, Poland.
As a matter of note, his wife answered Russia, Russia, Russia in both censuses.
What part of that area would have switched from Russia to Poland 1920-1930?? And, where might it be today?