What do you mean by "let" ???
Does Cali WANT to be its own nation ???
Is there a humanitarian crisis there, as there was in Kosovo ???
This is a very lame analogy !!!
Try not to compare apples and door knobs.
I did not see a problem with your English, -- it seems to be better than most native speakers -- conversely, I understood quite well.
I was only challenging your implication that California will eventually declare its independence. There is no reason to declare it and what happened to the people of Kosovo did not happen to the people of California, so I don't see how this could be a precedent.
There is no "if they declare" because it will NEVER happen without a good enough reason !!!
@ asker (final reply):
"...it would have suggested to its regions that they also can ask for their independency..."
■ ...IF AND ONLY IF the respect for human rights, fundamental freedoms, equality, and self-determination of peoples are violated!
(no precedent for Cali)
"Kosovo has not a humanitarian issue but it's more an identity issue : different religion, language and people."
■ This "identity issue" was more of a problem for Serbia than Kosovo. In addition, the MANNER in which those three aforementioned elements of the "identity issue" were dealt with is what MADE it a humanitarian issue!
"This region was already a region with political problems at the Roman times."
■ No, the problems were administrative (empire, colony, despotate, principality, et cetera). There's a difference!
"California does not completely agree with the actual government on political matters such as ecology and environment, and these matters could be a path to a 'sort of independency'."
■ The disagreement is about the national standards of motor vehicle emissions set by the Federal Government of USA being lower than the more strict standards desired by the State Government of California. There is no chance that this is a legitimate reason to break away from the Union!
■ California has its own State Government and is already "sort of independent."
"My question could be considered as an idea, a point to start to think about differences between the States of your country."
■ This idea that a State of USA wanting to break away from the Union is non-existent!
■ Yes, of course they are different! Each State governs itself independently from each other!
"It's difficult to understand from an European point of view to consider that all the people living in the USA are the same from west to east : on such a large territory, I was just wondering how can this be possible."
■ Learn the difference between Federal and State Governments. The EU can be looked at as the Federal Government of European nations that have their own governments, as well.