Refused by us border?

travel to us for long weekend by greyline,have B1/B2 valid 10 years visit visa,reside in Canada...criticized by border agent.have went to us before,alwasy left before visa expire,first they ask me more paper work,then they still refuse me..... feel so bad,is us border agent have such a power,to treat people even... show more travel to us for long weekend by greyline,have B1/B2 valid 10 years visit visa,reside in Canada...criticized by border agent.have went to us before,alwasy left before visa expire,first they ask me more paper work,then they still refuse me.....

feel so bad,is us border agent have such a power,to treat people even with leagal document.

they refuse me without a reason,they're over re act?

any help?
4 days ago
Additional Details
4 days ago

they think or imagine me will stay in us for ever...in fact,i have good life in canada,just want to visit us,not live there....but they don't listen and believe me.
4 days ago

all the paper work is valid,they try to find a reason,but couldn't....so just let me go home.
4 answers 4