How will Amazon help or hurt the USA ? why?

Update: people are now buying more from Amazon than probably anywhere? most packages these days are Amazon packages? when, which years this happened? and how is changing society and economy in USA ? why?
Update 2: EXAMPLE....BEFORE IF WANTED TO BUY A NEW COMPUTER PRINTER...YOU WENT INTO A ELECTRONICS STORE LIKE "BEST BUY"? OR "CIRCUIT CITY"? NOW YOU JUST ORDER ONE ON AMAZON? , WHICH YEARS THIS TRANSITION MOST OCCURED YOU THINK AND WHY?
Update 3: WHICH YEARS SAW THIS TRANSITION HAPPENING THE MOST AND WHY THINK SO?
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