sentences:  It began as two separate plants, the Sangamon and the Oak Ordnance Plants, separated by Illinois Route 36 and operated by Remington Rand and Johnson & Johnson respectively.Prior to the end of World War II, the facility was consolidated into the Sangamon Ordnance Plant, operated by Remington Rand.Construction began in early 1942 following the acquisition of local farms through eminent domain with the ground breaking occurring in April 1942.