Census Bureau in 2015: |- These are the metropolitan areas of the Southeastern region which exceed one million in population according to the United States Census Bureau's 2016 estimates: Combined statistical areas Beyond Megalopolis by Virginia Tech's Metropolitan Institute, an attempt to update Jean Gottmann's work with current trends, defines two "megapolitan areas" contained within the Southeast, out of a total of ten such areas in the United States: "Piedmont" extending from North Carolina to Alabama "Peninsula" covering South Florida and Central Florida Two others tie some areas on the margins of the Southeast to urban centers in other regions: "Gulf Coast" extending as far east as the western tip of Florida "Northeast" including much of Maryland, Central Virginia, and Eastern Virginia. These are the combined statistical areas of the Southeastern region which exceed 1 million in population according to the United States Census Bureau's 2016 estimates. Note that the metropolitan areas of Tampa and Richmond are not included in any CSAs, so they are included in the table without constituent areas. Culture The predominant culture of the Southeast U.S. has its origins with the settlement of the region by European colonists and African slaves during the 17th to 19th centuries, as large groups of English, Scottish, Scotch-Irish, Germans, Spanish, French, and Acadians migrated to the region. Since the late 20th century, the "New South" has emerged as the fastest-growing area of the United States economically. Multiculturalism has become more mainstream in the Southeastern states. African Americans remain a dominant demographic, at around 30% of the total population of the Southeast. The New South from a Southeastern standpoint, is largely built upon the metropolitan areas along the Interstate 85 (I-85) corridor. Cities along this corridor from north to south include Raleigh-Durham area, Greensboro, Charlotte, Spartanburg, Greenville, Atlanta, and Montgomery. Climate Most of the southeastern part of the United States is dominated by the humid subtropical climate (Cfa/Cwa). As one nears the southern portion of Florida, the climate gradually becomes tropical, as the winter season and all months have a mean temperature above (the defined coldest monthly mean temperature of tropical climates). Seasonally, summers are generally hot and humid throughout the entire region. The Bermuda High pumps hot and moist air mass from the tropical Atlantic Ocean and eastern Gulf of Mexico westward toward the southeast United States, creating the typical sultry tropical summers. Daytime highs are often in the upper