No, Catalonia is not a really popular tourist spot for American citizens to go to on vacations. The main spots that Americans like to visit which are outside our borders are mainly beaches in Mexico, and places in Europe, especially Italy. Catalonia is not high on any ones tourist list.
There are probably many Americans that visit Catalonia; however, it isn't really a popular tourist destination. Americans are more likely to visit famous US cities (like NY, LA, Miami), Caribbean and Latin American hotpots (like Cancun, Mexico and the Bahamas), famous European capitals (like Paris, Rome, Berlin,Athens, Hong Kong, etc.), and ancient landmarks (pyramids of Giza).
I do not believe Catalonia is a popular tourist destination among American citizens. One reason for this is the fact that the average American citizen simply can not afford vacations and certainly not ones that require traveling long distances. Secondly, a large part of the population knows noting about Catalonia.
Most Americans are not even aware of a place called Catalonia. It is not a popular tourist destination for Americans. Although it has many excellent places to visit, there is not much marketing for it, and many people are unaware of all it has to offer. In the future it might become more popular.
No, Catalonia is not a popular tourist destination among American citizens, because most people do not know it exists. If they do know about it, they do not know anything that sets it apart. It is hard for an American to decide to go to Catalonia, when they could be going to Barcelona, Madrid, or Paris.