McDonald's, KFC, and Taco Bell have gone to war in the $100 billion delivery market — and there's a

On Thursday, KFC and Taco Bell announced plans to roll out delivery at thousands of restaurants through a partnership with Grubhub.  McDonald's rolled out delivery with UberEATS at 5,000 locations in the US in 2017, and says that the service is driving sales. McDonald's still has the upper hand — but with the Grubhub deal, KFC and Taco Bell have a major opportunity to enter the fast-food deliver war.    Fast-food delivery battles are heating up.  On Thursday, Yum Brands — the...