American english contribution to global english

References:

1. 
   English (United States) at Ethnologue (18th ed., 2015) (subscription required)
   
2. 
   "Unified English Braille (UEB)". Braille Authority of North America (BANA). November 2, 2016. Retrieved January 2, 2017.
   
3. 
   "English"; IANA language subtag registry; subject named as: en; publication date: 16 October 2005; retrieved: 11 January 2019.
   
4. 
   "United States"; IANA language subtag registry; subject named as: US; publication date: 16 October 2005; retrieved: 11 January 2019.
   
5. 
   Crystal, David (1997). English as a Global Language. Cambridge: Cambridge University Press. ISBN 978-0-521-53032-3.
   
6. 
   Engel, Matthew (2017). That's the Way It Crumbles: the American Conquest of English. London: Profile Books. ISBN 9781782832621. OCLC 989790918.
   
7. 
   "Fears of British English's disappearance are overblown". The Economist. July 20, 2017. ISSN 0013-0613. Retrieved April 18, 2019.
   
8. 
   Harbeck, James (July 15, 2015). "Why isn't 'American' a language?". BBC. Retrieved April 18, 2019
   

1^ English (United States) at Ethnologue (18th ed., 2015) (subscription required)

2^ "Unified English Braille (UEB)". Braille Authority of North America (BANA). November 2, 2016. Retrieved January 2, 2017.

3^ "English"; IANA language subtag registry; subject named as: en; publication date: 16 October 2005; retrieved: 11 January 2019.

4^ "United States"; IANA language subtag registry; subject named as: US; publication date: 16 October 2005; retrieved: 11 January 2019.

5^ Crystal, David (1997). English as a Global Language. Cambridge: Cambridge University Press. ISBN 978-0-521-53032-3.

6^ Engel, Matthew (2017). That's the Way It Crumbles: the American Conquest of English. London: Profile Books. ISBN 9781782832621. OCLC 989790918.

7^ "Fears of British English's disappearance are overblown". The Economist. July 20, 2017. ISSN 0013-0613. Retrieved April 18, 2019.

8^ Harbeck, James (July 15, 2015). "Why isn't 'American' a language?". BBC. Retrieved April 18, 2019