makes up the largest religious group in Lakeland. As of 2013, an estimated 300 churches existed with an address in the city. Economy Lakeland is the largest city on Interstate 4 between Orlando and Tampa. Large industries in the Lakeland area are citrus, cattle, and phosphate mining. In the past few decades, tourism, medicine, insurance, transportation, and music have grown in importance. Citrus growing dates back to the early settlers who planted trees in the area in the 1850s. After a series of freezes in counties north of Polk County, the area became the focal point for citrus growing in Florida. Although citrus is no longer the largest industry in the area, it still plays a large part in the economy of Lakeland and Polk County. Phosphate mining is still important to the economy of Lakeland, although most of the mining now takes place farther south. The Bone Valley produced 25% of the U.S. phosphate supply. Lakeland's largest employer is Publix Supermarkets. Publix is one of the largest regional grocery chains in the United States with over 1,200 stores across the American South. Publix employs over 6,500 people in the Lakeland area including headquarter and warehouse employees. Lakeland is a transportation hub. FedEx Freight and FedEx Services and the Saddle Creek Corporation employ over 600 people in the area. Other large employers in the area include Amazon, GEICO, Rooms To Go, and Lakeland Regional Health. Culture The Lakeland History Room is a special collections archive established in 1987 housed within the Lakeland Public Library's main branch. The Lakeland History Room maintains the City's collection of historical materials as well as other locally relevant collections composed of documents, photographs, maps, building plans, audio/visual media, scrapbooks, specialty items like citrus crate labels, artwork, yearbooks, posters, and postcards. The LHR maintains a large digital collection with over 7,000 images of the city of Lakeland, its landmarks, significant historical moments, cultural institutions, and prominent citizens. The LHR provides one-on-one assistance with historic research, a history lecture series with prominent local historians, a DIY Digitizing Lab for personal material preservation, and genealogical programs and resources. In 2019, an initiative led by Lakeland City Commissioner Phillip Walker, was first presented to the City Commission to create the City's first History and Culture Center. The project was unanimously approved by the Commission and funds were allocated for the project's construction; although, the exhibit's content design would be