The English drink tea.
One of my cousins, with Majorca's standard ice tea
The French drink wine.
The Finns drink vodka. (Oh yeah, so do the Russians, though not as much :)
Sure, they drink other things, but some places have their endemic drink of choice. In Italy, it's espresso everywhere. When I ordered tea at some restaurants, they gave me strange looks. In Kenya, passion fruit juice is their parallel to our orange juice - the standard juice you can assume will be available.
I'm not sure what Spain's drink is, but on Majorca at least, the ice tea niche is rather odd: Wherever I ordered ice tea, it was always the same. At a fancy hotel's restaurant, or an even fancier one, at a sidewalk cafe or a streetside bar, an expensive restaurant, anywhere - they always gave me a glass bottle of Nestea, and a glass with ice. Always the same Nestea logo, and exactly the same tea. Well, except for one place: they gave me a can of Nestea (same logo, same stuff) and a glass with ice. Apparently, there is no other ice tea on that island.
I'd always associated Germany with beer. But now that I've been to Germany, or at least one part of it, I think it's actually sparkling water. At restaurants and at people's homes, sparkling water is what they pour by default. If you want just water, you have to ask for "still water". Beer is something they might offer, or ask if you want, but plain sparkling water is what they assume you want without asking.
Got any others to add to the list?

One of my cousins, with Majorca's standard ice tea
The French drink wine.
The Finns drink vodka. (Oh yeah, so do the Russians, though not as much :)
Sure, they drink other things, but some places have their endemic drink of choice. In Italy, it's espresso everywhere. When I ordered tea at some restaurants, they gave me strange looks. In Kenya, passion fruit juice is their parallel to our orange juice - the standard juice you can assume will be available.
I'm not sure what Spain's drink is, but on Majorca at least, the ice tea niche is rather odd: Wherever I ordered ice tea, it was always the same. At a fancy hotel's restaurant, or an even fancier one, at a sidewalk cafe or a streetside bar, an expensive restaurant, anywhere - they always gave me a glass bottle of Nestea, and a glass with ice. Always the same Nestea logo, and exactly the same tea. Well, except for one place: they gave me a can of Nestea (same logo, same stuff) and a glass with ice. Apparently, there is no other ice tea on that island.
I'd always associated Germany with beer. But now that I've been to Germany, or at least one part of it, I think it's actually sparkling water. At restaurants and at people's homes, sparkling water is what they pour by default. If you want just water, you have to ask for "still water". Beer is something they might offer, or ask if you want, but plain sparkling water is what they assume you want without asking.
Got any others to add to the list?
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When I came back from Italy and France in high school, I asked for an espresso machine, but what it turned out I really wanted was coffee made like the regular coffee there -- some of the same flavor notes, very strong but drinkable in full-size cups, and bitter without being burnt. I buy espresso beans, grind them drip, and put extra in the basket. Which is probably exactly the same thing.
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And iced drinks in general I think are more uniquely American. Most other places don't put ice in drinks, such as water, soda, and the like.
Then there's every country's weird food, that is oddly popular in that country and most other people find repulsive. You know, like natto in Japan, vegemite in Australia, haggis in Scotland. Surprisingly, America's is peanut butter. Lots of people from outside the US find the idea of peanut butter disgusting, apparently.
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About drinks: I'm still amused that you don't have Schwipp-Schwapp or Mezzo-Mix in the US.