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 a marginal seat but with progressive redistributions lost Labor-voting areas to Victoria Park, Canning and Welshpool, and became substantially safer for the Liberal Party.
Relevant evidence: Yes