Hello Raj raman rajawat
Hope you are having a nice day!
American english is known as united states English or US english in an account of various native english language used in England. But English has been changing in this way for hundreds of years. So most of the people learn this language. Meaning of many words are different in a comparison to other english language spoken worldwide.But people learn this language because it is globally accepted language and used in corporate society like various marketing companies, call centers as well as in the field of mass media to sound more appropriate to their customers.And the most important point to be noted is that they carry an inconsistent intonation which makes them poles apart from other english accent. And everyday US English is growing faster and people are getting familiar with it.
All the best for your bright future.