Because of the Chinese exclusion act
The Chinese Exclusion Act, passed on May 6, 1882, prohibited/suspended Chinese immigration into the US during the 1880's. - Yüri -
Chinese exclusion act of 1882
You can not act Chinese as in your traits, but you can definitely get involved with their culture. For example, you could celebrate the Chinese New YearWell, I can tell you first hand that there...
You can find it online with English subtitles.