Many West Germanic dialects underwent a series of sound shifts. The Anglo-Frisian nasal spirant law and Anglo-Frisian brightening resulted in certain early Germanic languages evolving into what are now English and West Frisian, while the Second Germanic sound shift resulted in what would become (High) German. Dutch underwent none of these sound changes and thus occupies a central position in the West Germanic languages group. Standard Dutch has a sound inventory of 13 vowels, 6 diphthongs and 23 consonants, of which the voiceless velar fricative (hard ch) is considered a well known sound, perceived as typical for the language. Other relatively well known features of the Dutch language and usage are the frequent use of digraphs like Oo, Ee, Uu and Aa, the ability to form long compounds and the use of slang, including profanity. The Dutch language has many dialects. These dialects are usually grouped into six main categories; Hollandic, West-Flemish/Zeelandic, East Flemish, Brabantic and Limburgish. The Dutch part of Low Saxon is sometimes also viewed as a dialect of Dutch as it falls in the area of the Dutch standard language. Of these dialects, Hollandic and Dutch Low Saxon are solely spoken by Northerners. Brabantic, East Flemish, West-Flemish/Zeelandic and Limburgish are cross border dialects in this respect. Lastly, the dialectal situation is characterised by the major distinction between 'Hard G' and 'Soft G' speaking areas (see also Dutch phonology). Some linguists subdivide these into approximately 28 distinct dialects. Dutch immigrants also exported the Dutch language. Dutch was spoken by some settlers in the United States as a native language from the arrival of the first permanent Dutch settlers in 1615, surviving in isolated ethnic pockets until about 1900, when it ceased to be spoken except by first generation Dutch immigrants. The Dutch language nevertheless had a significant impact on the region around New York. For example, the first language of American president Martin Van Buren was Dutch. Most of the Dutch immigrants of the 20th century quickly began to speak the language of their new country. For example, of the inhabitants of New Zealand, 0.7% say their home language is Dutch, despite the percentage of Dutch heritage being considerably higher. Dutch is currently an official language of the Netherlands, Belgium, Suriname, Aruba, Sint Maarten, Curaçao, the European Union and the Union of South American Nations (due to Suriname being a member). In South Africa and Namibia, Afrikaans is