Which area of Poland produced the largest number of immigrants to the USA in the

Question:

Which area of Poland produced the largest number of immigrants to the USA in the early 1900's?

I realise the map of Poland is completely different today than what it was in 1912, but which areas of what was at that time Poland, had the heaviest levels of emmigration to America. And what was the peak year for immigration of Poles to the USA?

Best Answer - Chosen by Asker: At that time, the northern regions around the city of Danzig and inland about fifty miles or so. What was formerly known as Prussia.