Significant Jewish immigration to Argentina around 1900 is linked to the establishment of Jewish agricultural colonies in the province of Entre Rios (possibly inspired in part by the earlier Ukrainian colonies set up by the Russian government after 1846).
An overview of the subject (for genealogists) is given by Gabriel Braunstein here
He notes that the 200,000 Jews of Argentina are about half the total Jewish population of Latin America.
He distinguishes four periods:
The second period begins with the offer of land for Jewish agricultural colonization by the Argentinan government in 1881 and colonization begins in 1889 with the arrival of 820 Jewish colonists from Podolia, going to the province of Santa Fe (Moises Ville or Kiryat Moshe).
The JCA was founded in 1891 (funded by Baron Hirsch).
For details see the cited article, which also provides the following table of 18 colonies and dates of foundation.
|Moises Ville||1889||Santa Fe|
|San Antonio||1892||Entre Rios|
|Baron Hirsh||1905||Bs. As/La Pampa|
|Lopez and Berro||1907||Entre Rios|
|Santa Isabel||1908||Entre Rios|
|Curbelo and Moss||1908||Entre Rios|
|Narcisse Leven||1909||La Pampa|
|Dora||1911||Santiago del Estero|
|Louis Oungre||1925||Entre Rios|
|Leonard Cohen||1937||Entre Rios|
Source: Gabriel Braunstein, link suggested by Pavel Bernshtam
We have considerable information on the Chervin Family in Argentina (with Ukrainian origins).
Asociación de Genealogía Judía de Argentina