Since the Great Recession, the wealth gap between poor whites and poor blacks and Hispanics collapsed (all the poor people are living in similar poverty), but the wealth gap in the middle class grew: middle class blacks and Hispanics are worse off than middle class whites, a phenomenon that's increased since 2008/9.
There aren't enough rich black and Hispanic families in the USA to make good comparisons.
The gap between poor whites and other groups was closed because poor white people (who had more than the others) got poorer.
Among lower- and middle-income households, white families have four times as much wealth as black families and three times as much as Hispanic families. In 2016, lower-income white households had a net worth of $22,900, compared with only $5,000 for black households and $7,900 for Hispanic households in this income tier. To some degree, this reflects differences in homeownership rates among families – 49% for lower-income whites, versus 31% for lower-income blacks and 30% for lower-income Hispanics. It is also important to note that only 25% of white households are in the lower-income tier, compared with about 50% each of black and Hispanic households. Thus, low levels of wealth are much more prevalent among black and Hispanic households than among white households.
About the same level of wealth inequality exists among middle-income households. White households in the middle-income tier had a median net worth of $154,400 in 2016, compared with $38,300 for middle-income blacks and $46,000 for middle-income Hispanics. Homeownership rates among middle-income blacks (53%) and Hispanics (60%) are also less than among middle-income whites (76%). Half of white households, 42% of black households and 40% of Hispanic households are in the middle-income tier.
How U.S. wealth inequality has changed since Great Recession [Rakesh Kochhar and Anthony Cilluffo/Pew Research]
(via Naked Capitalism)