President Donald Trump’s escalating trade war with Canada is raising fresh concerns in battleground states ahead of the November midterms.The U.S. and Canada have imposed tariffs on billions of dollars’ worth of goods, while Washington has also banned nearly $1 billion in Canadian imports, including alcohol, dairy products and motorcycles.The latest measures took effect Sept. 29 as negotiations remain unresolved.Trump says the tariffs will bring manufacturing back to the United States and protect American industries. But businesses could cut production, consumers could face higher prices and m...