What is going on with Argentina? It straddles what would be UTC-4 and UTC-5, so one would expect it to be in one of those time zones, or to be a two time zone country using both of those, but it is actually in UTC-3 (which is why it is all deep red in the map).
According to Wikipedia [1]:
> The first official standardization took place on 25 September 1894. The official time switched between UTC−4 and UTC−3 from 1920 to 1969, and then between UTC−3 and UTC−2 from 1974 to 1993. [...] On 7 March 1993, it was fixed at UTC−3, called Argentina Time.
I can sort of see UTC-3 if they felt it was important to be in the same time zone as Brazil...but I can't even come up with a guess as to how UTC-2 was ever an option.