(This is my own opinion btw)
There was already a big wage and financial gap between the rich and poor of all races, but many people whose family had originally lived in a country for many years e.g grandparents great grandparents, usually have some type of asset or assets that they can use to support themselves in financial crisis like a house that was passed on through generations (now they don’t have to pay rent like many others that don’t own a home) or inheritance and savings that they could save over time. But immigrants may not have these types of assets in the country they had moved to.