They’re winning the wage war. Campaigns for a $15-an-hour state minimum wage hit milestones in California and New York late Thursday with new bills instituting the massive pay hike for the states’ poorest — a move opponents say will cause layoffs and stifle small business. California and Massachusetts already boast the highest state minimums at $10 an hour, while the District of Columbia’s is $10.50. After Gov. Jerry Brown signs the legislation on Monday, as promised, the Golden State will begin gradual increases next January, hitting $15 in 2022.