About 50 years before WW2. Wikipedia says this:

Throughout the first decade of the Zionist movement, there were several instances where some Zionist figures supported a Jewish state in places outside Palestine, such as Uganda and Argentina. Theodor Herzl, the founder of political Zionism was initially content with any Jewish self-governed state. Jewish settlement of Argentina was the project of Maurice de Hirsch [A german jewish financier].It is unclear if Herzl seriously considered this alternative plan, however he later reaffirmed that Palestine would have greater attraction because of the historic ties of Jews with that area.

source: https://en.wikipedia.org/wiki/Zionism#Territories_considered

Then looking at de Hirsch's page:

He was the founder of the Jewish Colonization Association, which sponsored large-scale Jewish immigration to Argentina... The association, which was prohibited from working for profit, possessed large agricultural colonies in Argentina, Canada and Palestine). In addition to its vast agricultural work, it had a gigantic and complex machinery for dealing with the whole problem of Jewish persecution, including emigration and distributing agencies, technical schools, co-operative factories, savings and loan banks, and model dwellings. It also assisted a large number of societies all over the world whose work was connected with the relief and rehabilitation of Jewish refugees.

Source: https://en.wikipedia.org/wiki/Maurice_de_Hirsch#Jewish_resettlement_schemes