The US hasn't adopted EMV because it isn't necessary. EMV was created because in Eastern Europe many businesses didn't have sufficiently reliable phone and internet connections to validate credit cards -- in the US we have no such problem.
The cost of rolling out EMV was determined to be greater than the cost credit card companies paying for the increase in fraud and chargebacks out of pocket.
The cost of rolling out EMV was determined to be greater than the cost credit card companies paying for the increase in fraud and chargebacks out of pocket.