I saw a lot of "U"s and "R"s on many signs.
And these protests are highly orchestrated. Notice all of the printed signs, t-shirts, and ball caps. These protests are organized and paid for by La Raza, MEChA, the Congressional Hispanic Caucus, and by the Mexican government.
A couple of years ago when they had large protests, you could see a sea of Mexican flags with no American flags anywhere to be seen. It was a PR nightmare for them, and within a couple of days, all of the Mexican flags disappeared from view. Someone from on high had given the word to replace them with the US flag.