Consider Causes and List Effects to Gather Details
Alright so I never actually read the book so please take this with a grain of salt. From what I have just read it seems that Gogol comes to accept his non-American side and appreciate his Indian-American identity. I'm not sure why he comes to terms with it, but apparently he does. In the ending he sits down and reads the book his dad gives him by Nikolai Gogol. So yes, I think he does accept his name. However I strongly encourage you to verify that if you have the book. I hope this helped :)
It would be a subordinate cause, for it can't stand on its own. Think about it: Since early this morning. What happened since early morning? Since it doesn't provide that information, it wouldn't be able to be an independent cause.
Also, I don't believe that the sentence is grammatically correct :)
