There is conflicting info regarding Paul Christiansen Nissen:

On 9 October 1914, a Paul Christiansen 26 arrived New York from Liverpool on the ship Celtic, listed as a U.S. citizen born 4 January 1888 in Marlin, Ohio. (Also listed as his destination, but no such place is listed in U.S. Atlas)

In 1917, Paul Nissen born 28 April 1890 registered for the draft in Saginaw, Michigan:
He listed birthplace as "S. W. HOPN (HOIN?) Germany" and listed an unnamed dependant wife (attached).

1920 Saginaw census: Paul Nissen 29, single, born Saxony Germany.

In 1925, listed as both Paul (Christiansen) Nissen and Paul (Nissen) Christiansen (attached) born 28 April 1890 applied for naturalization in Milwaukee, Wisconsin. He listed arrival in US as 9 October 1914 NY. His application was "dismissed" 13 April 1925. His address was listed as St Charles Hotel, Milwaukee.

1930 Wichita Kansas census:
Paul Nissen 39 Germany, parents b. Germany, to US 1914, age at first marriage 34
Margaret L. Nissen 29 Wisconsin, parents b. Denmark, age at first marriage 24
Paul A. Nissen Jr 3-3/12 Kansas

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

1900 Winnebago, Wisconsin census:
Theo Rasmussen, May 1861 Denmark, to US 1891
Louise Rasmussen, Jan 1860 Denmark, to US 1891
Oscar Rasmussen, Dec 1885 Denmark, to US 1891
Jennie Rasmussen, Sep 1887 Denmark, to US 1891
Louis Rasmussen, Jan 1889 Denmark, to US 1891
Emma Rasmussen, Jul 1891 Wisconsin
Adler Rasmussen, Dec 1898 Wisconsin

1910 Cresbard, Faulk County, South Dakota
Theodore Rasmussen 49 Denmark, to US 1891
Louise A Rasmussen 50 Denmark, to US 1891
Emma C Rasmussen 18 Wisconsin
Adler Rasmussen 11 Wisconsin
Marguerite A Rasmussen 9 Wisconsin

(Perhaps the Theodore listed in Wisconsin death index was a child born after Margaret, who did not survive?)

1920 Kenosha, Wisconsin
Theo Rasmussen 59 Denmark, to US 1917 [maybe year of return to Wisconsin)?]
Louisa Rasmussen 60 Denmark, " " "
Margaret Rasmussen 19 Wisconsin
Arthur Davis 20 Wisconson (lodger)

1930 Kenosha, Wisconsin
Theodore Rasmussen 68 Denmark, to US 1891
Luise Rasmussen 69 Denmark, " " "

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5 May 1891, arrived NY from Bremen on ship Ems:
Theod. Rassmussen 29
Louise " 30
Ernst " 4
Dagmar " 3
Jens " 6 mos

Here is their registration at Copenhagen for emigration:

Name: Rasmussen, Th. Occupation: Murer
Age: 29 Destination: Oshkosh, Wisc.
Contract no.: 322600 Registration date: 4/18/1891
Birth place: ? Birth place: ?
Last res. parish: Nykøbing Falster Last res. county: Maribo
Last residence: Nykjb. F. Destination country: USA
Destination city: Oshkosh Destination state: Wisconsin
Name of ship: Indirekte
IDcode: I9091R1913

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Name: Rasmussen, E. Occupation: Barn
Age: 04 Destination: Oshkosh, Wisc.
Contract no.: 322600 Registration date: 4/18/1891
Birth place: ? Birth place: ?
Last res. parish: Nykøbing Falster Last res. county: Maribo
Last residence: Nykjb. F. Destination country: USA
Destination city: Oshkosh Destination state: Wisconsin
Name of ship: Indirekte
IDcode: I9091R1915

--------------------------------------------------------------------------------
Name: Rasmussen, J. Occupation: Barn
Age: 02 Destination: Oshkosh, Wisc.
Contract no.: 322600 Registration date: 4/18/1891
Birth place: ? Birth place: ?
Last res. parish: Nykøbing Falster Last res. county: Maribo
Last residence: Nykjb. F. Destination country: USA
Destination city: Oshkosh Destination state: Wisconsin
Name of ship: Indirekte
IDcode: I9091R1917

--------------------------------------------------------------------------------
Name: Rasmussen, D. Occupation: Barn
Age: 03 Destination: Oshkosh, Wisc.
Contract no.: 322600 Registration date: 4/18/1891
Birth place: ? Birth place: ?
Last res. parish: Nykøbing Falster Last res. county: Maribo
Last residence: Nykjb. F. Destination country: USA
Destination city: Oshkosh Destination state: Wisconsin
Name of ship: Indirekte
IDcode: I9091R1916

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Name: Rasmussen, L. Occupation: Hustru
Age: 30 Destination: Oshkosh, Wisc.
Contract no.: 322600 Registration date: 4/18/1891
Birth place: ? Birth place: ?
Last res. parish: Nykøbing Falster Last res. county: Maribo
Last residence: Nykjb. F. Destination country: USA
Destination city: Oshkosh Destination state: Wisconsin
Name of ship: Indirekte
IDcode: I9091R1914

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Here is the family in the 1890 Nykøbing, Maribo census:

Maribo, Falsters Sønder, Nykøbing Falster Købstad, matr. 8bd, forhus 1. etage,, Nykøbing Købstad, , , 1, FT-1890
Name: Age: Marital status: Occupation in household: Occupation: Birth place:
Theodor Rasmussen 28 Gift husfader murersvend Vaabensted Sogn, Maribo Amt
Louise Anna Johanne Rasmussen 29 Gift husmoder Hunseby Sogn, Maribo Amt
Erish Oskar Carles Rasmussen 4 Ugift barn Nykøbing Falster
Dagma Jenny Engeborg Rasmussen 2 Ugift barn Nykøbing Falster
Jens Martin Lauritz Rasmussen 1 Ugift barn Nykøbing Falster

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Theodor Rasmussen was born 17 May 1861 Vaabensted,
parents Knud Rasmus Larsen and Margrete Martinsdatter

Louise Anne Johanne Nielsen was born 4 January 1860 Hunseby,
parents Niels Pedersen and Anne Eriksdatter

Theodor Rasmussen and Louise Anne Johanne Nielsen married 7 August 1885 Nykøbing

Ernst Oscar Charles Rasmussen born 14 Dec 1885 Nykøbing

Dagmar Jenny Ingeborg Rasmussen born 23 Sep 1887 Nykøbing

Lauritz Jens Martin Rasmussen born 3 Jan 1889 Nykøbing