Good question. I think part of the reason for more blacks low reading skills is, to do with the history of being heavy slaves.

好问题,我认为黑人阅读能力差的部分原因是,他们经历了较长时间的奴役史。

麻省理工公开课 - 媒体、教育、市场课程节选

Whereas, 27% of whites are reading at a low level, 22% of Asian-Pacific kids are reading at low level.

也处于低水平，然而，27%的白人孩子阅读能力很差，而22%亚太地区的孩子阅读能力很差。

麻省理工公开课 - 媒体、教育、市场课程节选

Native Americans are also reading the low level.

阅读能力也很差，美洲原住民阅读能力。

麻省理工公开课 - 媒体、教育、市场课程节选