Pittsburgh, Pennsylvania Voters Elect First Black Mayor

Ed Gainey, the first black mayor of Pittsburgh, won the election with nearly 70% of the votes, defeating Republican Tony Moreno. Gainey will succeed Bill Peduto, continuing a 92-year Democratic winning streak. He aims to make Pittsburgh inclusive by addressing affordable housing, police reform, and diversity.

What is significant about the Democratic party's winning streak mentioned?

What issues did Gainey promise to focus on as mayor?