You guys won’t have general Civil War.
What you will have is a siege of Arizona. Accounts frozen and roads blocked by the ‘most ethical Government in history’.
It will be a case of how best to relieve Arizona, not necessarily how to defend yourselves.
Los Angeles will have its power and water cut off pretty early in any seige of AR, so that part of CA may see a lot of violence.
Oh yes, and the Federal forces will definitely try to seize the Hoover Dam.