* Climate: a shaded courtyard is pretty much necessary given the weather, for instance;
* History: not only most city centers in Spain were built in the Middle Ages, but they were also built in the Arabic tradition of having fountains, slated blinds;
* Economic: Spain grew economically a bit later than the US and the rest of Europe: 1980 rather than 1960, they had a similar wave of car adoption, but a decade after rebuilding the country after the Spanish war.
* Ecology: most of the country is pretty arid: there are beautiful vistas, but it’s not the place where one wants to stay out, baking in the sun, as much.
Spaniards want to be outside, but not in a sea of green grass. They much prefer a table in the shade.