The digital edition of Rumbos  [es] magazine analyzes the Galician influence in Argentina, and explains the country had two big migratory flows: between 1857 and 1930, a millon Galician arrived; and between 1946 and 1960, came another 110,000. From that total amount, 600,000 made Argentina their final home. Thus, half of the Spanish migrants that arrived to the country were born in Galicia. They even note:
It's a usual saying that Galicia has five provinces: La Coruña, Lugo, Orense, Pontevedra and… Argentina. […] So many people came [from Galicia] that, according to 1914 National Population Census, Buenos Aires housed about 150,000 Galician individuals, while in La Coruña, the most populated city by then, there were 60 inhabitants.
The article also notes the so called “migratory chain”, as emigration was a strategic family decision. The first link of that chain was a male family member, usually the most skilled who, once settled in his new home, called together the family he had left behind in Spain. Those who arrived later had here a countryfolk ready to help them.