I don't see the right to secede as being included in the 10th Amendment.
This is basic logic. If A (Any power not given to Congress is given to the states) and B (The power to secede is not given to Congress in the Constitution), then C (States have the right to secede). if you don't see the right to secede in the 10th Amendment, then you need a new pair of glasses. Plus, New York, Virginia, and Rhode Island explicitely ratified the Constitution under the pretext that they could secede at any time.
Or that the United States fought a war to protect their right to secede from Great Britain?
No, they fought a tax revolt that got turned into a revolution. Independence was, except for a few Yankee hotheads, not the intent of the colonists at first.
Regardless, the end result of the war was that the colonies seceded from Great Britain.
You only have the right to secede if you can make it stick by force of arms. (or the otherside just lets you) It might not be right, but it is what it is.
True, which is why the Founders placed the Second Amendment in the Constitution. Of course, with our ignorant lawmakers, it would be better to enforce it through civil disobedience of corrent gun control laws.