evidence: When President Biden traveled to Philadelphia last week to kick off a new effort to win over Black voters, he boasted that the gulf in wealth between White and Black Americans had narrowed on his watch. "The racial wealth gap is the lowest it’s been in 20 years because of our efforts," Biden said. [...] The racial wealth gap has narrowed by one measure — but grown by another one. The data on which Biden is relying starts in 2019, making it tough to untangle how much credit he can claim for the rise in Black wealth and how much belongs to former president Donald Trump.