Poland is officially a country now (again), recognized by the peace treaty,

ALLIES WELCOME POLAND AS NEW NATION
---
Cleneceau, in Transmitting Treaty, Explains Purpose of Some of its Provisions
---
OPEN WAY FOR HARMONY
---
Assure Protction and Equality to Embittered Peoples Incorporated in New State

which includes a provision that Poland has to be nicer to its Jews (Spoiler Alert: it won't be especially nice to its Jews).

In 1890, enumerators' instructions also included the sentence, "In case the person speaks Polish, as Poland is not now a country, inquire whether the birthplace was what is now known as German Poland or Austrian Poland or Russian Poland and enter the answer accordingly as Poland (Ger.), Poland (Aust.), or Poland (Russ.)."[120] Instructions for categorizing immigrants occupied a growing number of dense pages as the bureau struggled to capture with precision the political vagaries that produced languages in 1910 such as Wendish, Lettish, and "Rhaeto-Romanish (including Ladin and Frilulan)," or nationalities such as "Turkey in Europe" versus "Turkey in Asia."
[...]
In 1914 the census director assayed a different use of the same term; he described a forthcoming special report on "racial classes of population," which did not include Indians and Negros; the racial classes were distinguished by country of origin but were all contained within the "white population of foreign stock"[123] The Senate inserted "race" (meaning roughly European ethnicity) into the 1910 census, but the conference committee between House and Senate deleted it.[124] The census director explained to a Senate committee a few months later that " `race' in its broadest sense" should be understood as "five classifications, white, black, Chinese, Japanese, and Indians"--but another expert witness reported that a person born in Austria of Polish origin "is German or some other race--a Pole or a Bohemian" on the census.[125]