The government of Myanmar recognizes eight "major national ethnic races". The Brazilian census classifies people into brancos (Whites), pardos (multiracial), pretos (Blacks), amarelos (Asians), and indigenous (see Race and ethnicity in Brazil), though many people use different terms to identify themselves. The United States Census Bureau proposed but then withdrew plans to add a new category to classify Middle Eastern and North African peoples in the 2020 U.S. census, over a dispute over whether this classification should be considered a white ethnicity or a separate race. Legal definitions of whiteness in the United States used before the civil rights movement were often challenged for specific groups. Historical race concepts have included a wide variety of schemes to divide local or worldwide populations into races and sub-races. The establishment of racial boundaries often involves the subjugation of groups defined as racially inferior, as in the one-drop rule used in the 19th-century United States to exclude those with any amount of African ancestry from the dominant racial grouping, defined as "white". Such racial identities reflect the cultural attitudes of imperial powers dominant during the age of European colonial expansion. This view rejects the notion that race is biologically defined. According to geneticist David Reich, "while race may be a social construct, differences in genetic ancestry that happen to correlate to many of today's racial constructs are real." In response to Reich, a group of 67 scientists from a broad range of disciplines wrote that his concept of race was "flawed" as "the meaning and significance of the groups is produced through social interventions". Although commonalities in physical traits such as facial features, skin color, and hair texture comprise part of the race concept, this linkage is a social distinction rather than an inherently biological one. Other dimensions of racial groupings include shared history, traditions, and language. For instance, African-American English is a language spoken by many African Americans, especially in areas of the United States where racial segregation exists. Furthermore, people often self-identify as members of a race for political reasons. When people define and talk about a particular conception of race, they create a social reality through which social categorization is achieved. In this sense, races are said to be social constructs. These constructs develop within various legal, economic, and sociopolitical contexts, and may be the effect, rather than the cause, of While race is understood to be a social construct