The Question They Only Asked Males Over 21 in 1900

This 1900 census enumeration leaves the question of year of citizenship blank for these two ladies.
It wasn’t an oversight. It was because the census enumerator’s instructions were to only ask the question regarding year of citizenship of males over the age of twenty-one. The likely reason is because women in 1900 didn’t have a separate citizenship status from that of their husband–the two literally were one.