How many Americans speak English?

A list of English speaking population (As First Language and As Second language):

                             

America  (USA): 80.6% and 95.81%

United Kingdom: 92.14% and 97.74%

Japan*: N/A and 12% 








Sources: Wikipedia.com and for Japanese estimates reference.com 

* Japan's estimates are only indicative and do not have any concrete sources or references.