Led by a decline in football for the fifth straight year, participation in U.S. high school sports dropped in 2018-19 for the first time in 30 years, according to an annual survey conducted by the National Federation of State High School Associations. The 2018-19 total of 7,937,491 participants was a decline of 43,395 from the 2017-18 school year, when the number of participants in high school…