Is true the USA failing in other sports too? not only in soccer?

USA seems less dominant. In baseball latin players are starting to take over the American players places. Most of the shortstops in the mlb are now from Puerto Rico, Dominican, or Venezuela. In basketball Americans dominate the NBA style game but in international competions we dont meet expectations. We are ok in ice hockey but not great. We are better than the Czechs but not better than the Canadians. In fighting Americans are dominant but thats about it. Mayweather could beat any fighter in his path. Randy Couture could knock out any Mexican, Russian or Brazilian in his way. I mean Tito Ortiz got ed by Couture. Tennis Americans just plain suck. We are no good. Were probably better in futbol then we are in at tennis and i think the US national team is one of the top ten worst teams in the world up there with India, El Salvador and Samoa.