The large scale immigration of Japanese to South America was the result of specific programs (both private and supported by regional governments) to encourage immigration combined with the agreements of the countries affected.
Its certainly true that the Japanese were by far the largest group (0.25 million to Brazil alone), the Cantonese sugar and shit workers in Peru during the 19th century were still pretty significant at 0.1 million, certainly far bigger than the Guyanese south asians.
Actually, only in Brazil there's around 1.5 to 2 million Japanese decendents. Yes, it was not a "natural" influx, but mostly a sponsored migration to fulfill the labor demand of the coffee plantations, after a shortage of European labor. This kind of contracts were not specific to Japanese, but to Europeans immigrants as well. Most (or a good part) of European immigration to Brazil was sponsored. There was also a considerable migration to Brazil also after the WWII of Japanese people (and Eastern Europeans).
Because Asians are more motivated of working hard than Bolivians, correct me if I'm wrong.
Err... I don't know in your country, but, where I come from, this kind of statement is called racism.
Im glad to. You know, I particulary dislike Bolivians in my country. They dont like to play by local law and culture, they want even more rights than we have, and send most of what they earn to Bolivia. But they are hard working. The men do the jobs we dislike, like construction. And the women work cleaning houses. They are usually informal workers and work 12+ per day.
You'll love to hear the same about you if you want to go work someday in Europe or the US. Oh, the irony...
Difficulty for Argentina to attract high-skilled immigrants from Asia while embracing low-skilled immigrants from Bolivia and Paraguay with open arms. I think Argentina should emulate Canada or Australia's immigration policy of prioritizing high-skilled immigrants while restricting low-skilled immigrants mainly from Bolivia and Paraguay.
If we are talking about today's politics and economics, I'm sorry to disappoint you, but Argentina can't even garantee good jobs for their own citizens right now. I don't think that Latin America's biggest worry right now is to attract high-skilled immigrants. This isn't Canada.
By the way, Bolivians (now they're preferring to migrate to Brazil, specially to São Paulo, despite the language barrier) are only taking advantage of South American integration, which is pretty interesting to Argentina's government as well.
Curiously, there is a considerable Syrian and Lebanese community in Argentina (and in all Latin America), Carlos Menem was born a Muslim and only converted to Catholicism to be president. Today, if you visit Buenos Aires, you'll find out that most of the grocery shops are controlled by the Chinese.
Now, leaving today's world, I think that it's possible to have more Asian immigration to Argentina, but not too much. In Argentina, they don't have an overpriced commodity, like Brazilian coffee or the Peruvian guano. Their export table was cattle and grains and the need of labor force in this activities was much lower. The Asians could enter the country to work mostly on the development of the railway infrastructure (like they did in OTL in the US, Canada, Africa, etc.), only if there wasn't a HUGE offer of cheap labor from Europe that was rejected by the US (a.k.a. Italians)...