What change was noted when cities in texas were forced to change to single-member districts for at least some city council seats?

Substantial increase in minority city council members

Explanation: The change that was noted was that there was a substantial increase in the minority city council members,the voting right granted by the 1965 acts was very instrumental to the increasing participation of minority groups in Texas like the Latinos and African-Americans population,Texas has been known to descriminate against minority groups since 1845 until it was forced to change to single- member district for some city council seats.

the answer is mass marketing.

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