In a 1999 article , he suggested that a 19th-century California law helped create Silicon Valley 's hypermobility by prohibiting the enforcement of noncompete agreements .
California /location/location/contains Silicon Valley
IN DT CD NN , PRP VBD IN DT JJ NNP NN VBD VB NNP NNP POS NN IN VBG DT NN IN JJ NNS .
California
LOCATION
Silicon Valley
LOCATION
/location/location/contains