U.S. retailers are rushing in with faster-than-ever delivery deals and earlier Christmas promotions in hopes of easing the impact of this year’s shorter holiday selling season, a period that can be make-or-break for retailers. Thanksgiving, the traditional kick-off of the U.S. holiday shopping period, falls on Nov. 28 this year, a week later than last year’s Nov. 22, leaving retailers with six fewer days to drive sales between Thanksgiving and Christmas day. The last shortened shopping season was in 2013 – a year when retail chains and delivery companies scrambled to get packages to shoppers in time for Christmas.