Only reason why the USA is successful is due to whites and Asians.
Whites (non-Hispanics and some white Hispanics typically with Spaniard ancestry) make up 60% of the population and Asians/Eurasians/Pacific islanders make up another 7% of the population. That's why the USA has such a high median income, ppp gdp per capita, low unemployment rate etc. relative to Japan, South Korea and western Europe.
As soon as non-white hispanics(like 90% of hispanic Americans are non-white btw) and blacks become the majority , it will become like Greece or Spain, and eventually like some south American nation in 200 years when whites are like 25% of the population(if even that)