How might the belief in reincarnation provide a form of social control

Bonus question: according to wikipedia, in chinese philosophy yin and yang "describes how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent." what are some examples from the story that amy tan may have intentionally incorporated elements of yin and yang philosophy into this story? select 2.

Who gave the famous "i have a dream" speech at the march on washington?

Why does the united states constitution require that a national census be taken every ten years?