Global medical manufacturer Baxter International announced Thursday plans to build a $1 billion manufacturing center in Newton County that will employ more than 1,500 full-time workers. The plant will be the first built in the 1,400-acre Stanton Springs industrial park, located just west of Interstate 20 exit 101 at the intersection of Newton, Walton and Morgan counties; the park jointly-owned by those three counties and Jasper County. Baxter, which is based in Deerfield, Ill., employs 48,500 employees in 27 countries and is a leading developer of products for people with hemophilia, immune