You really need to check out the graph of GDP per person for the last 1,000 years in the U.S., Europe, and the rest of the world.
Then you need to ask yourself why everyone on the planet had a horrible income level since forever until around 1800.
Then you need to ask yourself why the income per person has gone up so dramatically since then?
Why has income in Europe gone up so much more than the rest of the world?
Why has the per person income in the US gone up even faster and farther than Europe?
How we can continue that trend for everyone on the planet?
Hmmm. I wonder if there are some reasons for the trends in that graph?
By the way, it is a fundamentally moral issue whether we extend that trend, or see per capita GDP go flat or even drop. That is an issue of morality.