1900: residential segregation numbers for San Antonio, Brownsville, Corpus, El Paso, Laredo.
Table 5.8 reports the indices of segregation for five cities  in 1900. The index of segregation is expressed as the percentage of Tejanos or Anglos that would have to residentially relocate from one of the city’s wards to another if both Tejanos and Anglos were represented in each ward in proportion to their presence in the total citywide population. Generally, a small index of segregation indicates residential diffusion of an ethnic group across the wards of a city, while a larger index results when an ethnic population is disproportionately clustered into only some of the wards.
Indices of Segregation for Five South, Central, and West Texas Cities, 1900
City Tejanos Anglos Brownsville 3.33% 20.06% Corpus Christi 26.58% 34.39% El Paso 25.64% 22.10% Laredo 5.16% 34.38% San Antonio 42.82% 10.59%
Overall, the indices in Table 5.8 demonstrate three different patterns of residential segregation among Tejanos and Anglos in the cities of south, central, and west Texas. The first is illustrated by the southern-most cities–Brownsville and Laredo–where the majority of the population were Tejanos. In these cities, the low index of segregation for Tejanos shows that Mexican Americans were quite generally distributed across the city wards, while the higher index for Anglos indicates more residential clustering. In San Antonio, where whites were a majority of the city’s population, the opposite patterns developed where Anglos were more generally distributed across the city and Tejanos clustered into a few wards. The third situation is illustrated by Corpus Christi and El Paso, cities where neither Tejanos nor Anglo Americans dominated the citywide population. In these  cities, the indices of segregation were relatively large for both groups, indicating that each group was residentially clustered into separate areas.
Residential segregation, therefore, did not occur in a single pattern in the cities of south, central, and west Texas during the nineteenth century….
Arnoldo de León and Kenneth L. Stewart, Tejanos and the Numbers Game: A Socio-Historical Interpretation from the Federal Censuses, 1850-1900 (Albuquerque: University of New Mexico Press, 1989), 86-88.
- For detailed discussion of the index of segregation, see Otis Dudley Duncan and Beverly Duncan, “Residential Distribution and Occupational Stratification,”American Journal of Sociology, 60 (1955), 493-503. Also see, Karl E. Taeuber and Alma F. Taeuber, Negroes in Cities: Residential Segregation and Neighborhood Change (Chicago: Atheneum, 1965), pp. 195-245.↩