Gavin Newsom told California residents that they would have to leave their homes only when it was necessary during a corona virus outbreak.
He previously estimated that more than 40 million people in his province could get Covid-19 virus infections in the next two months.
The corona virus has already killed 205 people in the United States while 14,000 people have been infected.
Almost 250,000 patients worldwide have been diagnosed with the virus that causes respiratory infections and approximately 9,900 have died.
Governor Newsom said on Thursday evening: "At this point we need to take some tough decisions.
We need to recognize the real situation." Its ordinance will allow residents to be converted into their homes to buy home or medicine needs, or when walking the dog or doing physical exercise, but will require them to stop attending social gatherings.
It will force businesses that are deemed to be unnecessary to close, while forcing other food and beverages and other essential household goods, pharmacies, banks and petroleum facilities to remain open.
Approximately half of the province's residents have already implemented such drastic measures, including the City of San Francisco.
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