False. using race as on of ta mix of factors that shape how congressional districts are drawn is legal, according to the supreme court of th united states
How the congressional districts are drawn
The Supreme Court of the United States has addressed cases related to racial gerrymandering, where the drawing of districts based predominantly on race has been challenged.
The Court's rulings have outlined that the consideration of race in drawing district lines is subject to certain legal constraints. While race can be a factor in redistricting, its use must adhere to constitutional principles
Hence it is false. Race is not one of the factors that is used to shape the legality of the congressional districts in the United States of America.