The state of California has always been different from the rest of the United States. In 2016, unlike most states, voters in California tightened the gun control laws and increased taxes on rich individuals. Cigarette taxes were hiked, and marijuana legalized. Multilingual education was promoted. The Democratic Party candidate Hillary Clinton, although she lost, was provided a winning margin of approximately two million popular votes. All these have inspired discussions about the secession of California from United States.
California vs rest of US
According to Tom Steyer of NextGen Climate, an organization combating climate change, it is not possible to view the Donald Trump campaign and then not see a threat to dignity and civil liberties of the California citizens. Steyer is himself a billionaire with a marked progressive outlook.
The nascent campaign of Californian independence was organized under 'Yes California Independence Campaign'. In Twitter, the tweet was #Calexit. There has been talks about constructing a wall around California so that forward thinking policies can be preserved from the reactionary onslaught of Washington. If the state actually secedes, it will be in an excellent position in economic terms, with the Californian economy taking the sixth rank around the globe, between France and Britain. It is to be kept in mind that talks about secession is not practical politics. It is simply the manner through which California may clash with Washington over a number of issues.
In practical terms, however, it will be a remote possibility for California to secede from the United States. This going away can be done in two ways: either engage in an all-out civil war or the Congress throwing California out. The US constitution does not allow secession. There can of course be a constitutional amendment- but it needs the approval of two-thirds majority in both houses of Congress. It also must be ratified by 38 of the 50 states. There is, however, a big chance of conflicts of policy between federal and state.
Climate change could be one wedge of contention between California and Washington. The state has secured top position in the reduction of greenhouse gas emissions. Even in September 2016, the state has made its policies much more secure by instituting a law which mandates reduction of harmful levels below to that of 40 percent level of the 1990s. These should be done within 2030.