Are you are using the census records for genealogy research?

 According to the history of the census,  the 1920 census included four new questions: one asking  the year of naturalization and three about mother tongue. 

The instructions to enumerators did not require that individuals spell out their names.

 Enumerators wrote down the information given to them; they were not authorized to request proof of age, date of arrival, or other information. The determination of race was based on the enumerator's impressions.