Even after reunification of Vietnam unequal wealth is the main problem

I do not think North Vietnam want unequal wealth between people in Vietnam, but Vietnam government still fight against the poverty.
USA also has the problem of poverty.

What is the difference between USA and Vietnam.about the poverty?

Some rich Americans donate their money to the poor.
I wonder rich Vietnamese also donate their money to the poor.

http://peoplesdemocracy.in/2015/0517_pd/40th-anniversary-reunification-Vietnam