Let me state how I feel with a little test of sorts...
“Eastern Westvia” applies to join the United States, It’s people vote for admission and the congress approves it’s admission into the United States.
The government spends billions of dollars on “Eastern Westvia” building all manner of government facilities including parks and military bases on land it bought from the new state.
In one of these federal lands the US military discovered a substance that when processed will light up New York State for a thousand years with a fleck of dust the size of a grain of sand.
This substance is found no where lese on the planet but “Eastern Westvia”.
The governor and the state legislature decide that with this new substance they no longer need to be part of the United States and decide to secede.
Can you in this case justify secession....
If they want to go then they go, message is this, you cannot keep any state in the Union by threats of force.