hakka

[Elkwg@aol.com]

I am interested in the Hakka culture in modern Taiwan for a scientific 
article I am writing. I understand Hakka are a unique ehtnic group of Han 
Chinese originallly from around the Yellow River, and one of the earliest Han 
settlers in China.  How are they different culturally from people in Taiwan 
called Taiwanese?  
    Does the term "Taiwanese" today include descendants those Formosans who 
were there before WWII as well as Chinese who entered when China became 
Communist. Are these two groups culturally or racially different as well? Why 
are they differentiated from Hakka in cultural summaries?