Languages of Belgium
Dutch is the official language of the Flemish Community and the Flemish Region (merged to Flanders) and, along with French, an official language of the Brussels-Capital Region. The main Dutch dialects spoken in Belgium are Brabantian, West Flemish, East Flemish and Limburgish. All these are spoken across the border in the Netherlands as well, and West Flemish is also spoken in French Flanders. Much like English, Flemish dialects have adopted much more French and other Romance vocabulary through mutual cultural exchange throughout history when compared with other Dutch dialects and as such they are not always readily intelligible for Dutch speakers outside Flanders. Words which are unique to Belgian Dutch are called "belgicisms" (as are words used primarily in Belgian French). The original Brabantian dialect of Brussels has been very much influenced by French. It is now spoken by a minority in the Capital region since the language of most inhabitants shifted during the Frenchification of Brussels.
Belgians
Belgians are primarily a nationality or citizen group, by "jus soli" (Latin: right of the soil), also known as birthright citizenship, and are not a homogeneous ethnic group. Belgians are made up of two main linguistic and ethnic groups; the Dutch-speakers (called the Flemish) and the French-speakers (mostly Walloons), as well as a third tiny but constitutionally recognized group from two small German-speaking areas. These sometimes competing ethnic and linguistic priorities are governed by constitutionally designated "regions or communities", depending on the constitutional realm of the topic, a complex and uniquely Belgian political construct. Since many Belgians are at least bilingual, or even trilingual, it is common for business, social and family networks to include members of the various ethnic groups composing Belgium.