Single-member district

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Single-member districts are electoral areas that elect one representative. They’re different from multi-member districts, which elect several representatives for the same area.

Where they’re used
- In the United States, most House districts are single-member. Other countries use the system differently: Australia and India elect lower-house members from single-member districts, while Singapore uses both single-member and multi-member districts.

What the idea is about
- The goal is to have a clear link between a voter’s district and the representative who speaks for that district in the legislature.
- Proponents say this strengthens accountability and keeps power in check. Critics say the district link can be weak in multi-member systems, and that single-member districts can encourage political manipulation through how districts are drawn.

How it has shaped voting
- In many places, single-member districts tend to favor two big parties over smaller ones. This is known as a two-party tendency.
- In first-past-the-post systems, the party that gets the most votes in a district wins the seat, even if a large minority supported other candidates across the district.
- A notable problem is gerrymandering: drawing district boundaries to help one party win more seats than its share of the vote would suggest. For example, in Wisconsin in 2018, Republicans won about 45% of the vote but about 64% of the seats.

Safe seats and turnout
- A safe seat is one where one party is almost guaranteed to win. This can lead to voters on all sides feeling their vote doesn’t matter, which can reduce turnout.

Alternatives and debates
- Proportional systems use multi-member districts and aim to match seats to overall vote share, which can give smaller parties a better chance.
- Some researchers argue that single-member districts don’t necessarily produce more geographically representative parliaments than multi-member systems.

Examples and contrasts
- Israel often uses a nationwide party-list system, where the entire country is a single constituency.
- In the United States, the move to single-member districts in the 19th century helped shape the current structure and sparked ongoing debates about fairness, representation, and control.