"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4NH-F7V : accessed 8 March 2016), America Duckworth in entry for Thomas Duckworth, 1860.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M64V-B3D : accessed 8 March 2016), America Duckworth in household of George Duckworth, Illinois, United States; citing p. 2, family 13, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,696.
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DNA Connections
It may be possible to confirm family relationships with America by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with America: