For every political jurisdiction in which your ancestor’s residence is located, do you know the bordering places? Do you know the township in which your ancestor lived and the bordering townships, the bordering states, provinces, etc.?
Do you know the names of the bordering parishes, etc. for use in church records?
Might be helpful to know these things.
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Keep in mind that boundaries for parishes, counties, etc. changed over the years. What was in one county in 1840 could have been in another by 1850!