It would be interesting to see what immigration does ITTL as the US would get a large amount of Russia, German, and A-H emigrants. Russia might well end up suffering brain drain like IOTL and have to deal with a lot of political issues around Poland and various ethnic minorities, plus their horrific poverty situation.
Very few immigrants from Russia to the U.S. or elsewhere during the prewar period were ethnic Russians, as shown below. The U.S. congressional reports on immigration actually show that the majority of immigrants were Jewish, followed by Poles, Lithuanians, Finns, and ethnic Germans. The majority of Jews were permanent immigrants with only 5% ever returning to Russia. The same was true of the ethnic Germans and to a lesser extent Scandinavians. The ethnic Russians were amongst the most skilled and wealthiest immigrants, so it is possible that most were skilled artisans, chefs, etc.
Immigrants from the Russian Empire and Finland to the USA 1899-1910
Jewish 765,531
Polish 471,378
Lithuanian 168,740
Finnish 148,183
German 100,817
Russian (Includes Belarussians & Ukrainians) 77,321
Scandinavian 13,624
Others 3,291
Female Immigrants as a Proportion of the Above
Jews 43.4%
Germans 40.6%
Finns 33.9%
Poles 30.5%
Lithuanians 29.4%
Russians 15%
For Austria-Hungary the number of Germans and Czechs immigrating to the U.S. peaked in the 1880s and had been declining. The number of Slavs however was increasing. The Ukrainians from Ruthenia were ranked amongst the poorest immigrants and least skilled coming to the U.S.
Immigration from Austria-Hungary
Germans 458,293
Poles 432,809
Slovak 374,624
Magyars 333,429
Croats & Slovenes 331,154
Jews 180,802
Ruthenes (Ukrainians) 144,710
Czechs 98,469
Romanians 76,755
Serbs 39,099
Dalmatians, Bosnians & Herzegovinians 31,047
Italians 19,410
Others 4,909
From Germany the emigration in 1913 was reduced to 25,000. This was mostly due to increasing economic opportunities as the country now attracted immigrants from neighbouring countries, with over 1 million foreign born residents by 1913.