What i love in Copa America is the matches always have a high chance to have many goals, not like Euro 2016, it's hard for a match to get over 2.5 goals.
Well that's because overall european teams tend to play lot more defensively and more tactical and maybe feel even more organized, I know it's less fun for public but that combination is proven to be winning formula for teams like Germany who won last WC.
European teams are lack of strikers, that's why they scored fewer.
Look at argentina striker , there is messi, aguero, higuain, tevez , lavezzi and many more!
Compare to Germany striker, who? Almost no pure striker!
despite not having a pure striker, but they have a lot of very good midfielder and always gave a lot of opportunities, so despite not having a pure striker, it was really very helpful.