https://www.aclu-wa.org/pages/voting-rights-faq
https://en.wikipedia.org/wiki/Washington_Voting_Rights_Act
In Texas, many local elections are single-district because we've always been under the Voting Rights Act
Example of at-large: County Tax Appraisal Board Member. (snooze....it's going to be At-Large...mainly because no one cares right now. ) All three positions are gonna be on everyone's ballot.
Other example: Small town with five City Council positions - Each voter votes for each five city council members
Examples of single member: City Council: Single-member representing each part of town.
All congressional districts
State representatives and state senate districts (Texas used to have some county at-large but that was like 70 years ago)
Advantages of at-large: Districts don't need to be drawn and elections are easier to administer.
Disadvantages of at-large: Minority areas or geographical areas of special interest are not represented.
Single-member districts are much better representation. Minorities tend to have lower turnout, so many times their voices are not represented in at-large races.
Even in areas without minorities, single-member district have areas of town with certain interests such as flooding, projects (downtown construction) newer areas: new construction, side walks etc.