This song is about Manu being so respected and praised in Europe and Latin America but when he went to the United States many people could care less about his music and message... it's pretty simple, Robbie Williams did a cover to this song, and had the same problem with being a mega star in Britain but when he came to the US he did not receive much praise.
https://primanota.net/manu-chao/bongo-vegetable-lyrics.htm