Question: Which city's southern suburbs were the location of an electoral district which lost Labor-voting areas to Victoria Park, Canning and Welshpool, and became substantially safer for the major political party in Australia founded in 1945?
Sentence (from "Electoral district of Clontarf"): It was located in the southern suburbs of Perth on the Canning River, including such suburbs as Wilson, Bentley, Karawara, Rossmoyne and Shelley.
Relevant evidence: Yes