The census indexes at Ancestry.com can give you perspective that you can't always get without it.
Searching on Ancestry.com with no names and a residence of Knox County, Illinois, in 1900, gave me 44,064 residents.
Searching on Ancestry.com with no names, a residence of Knox County, Illinois, and father and mother born in Sweden in 1900 gave me 8,712 matches.
Ancestry.com hence told me that 19.77% of the county had both parents born in Sweden. Now that's a figure a genealogist might need to know.
Great Tip. Thank you.
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