It’s sad that there is no mention that going to war must be a decision made by the representatives of the people, not by the president, as provided for in our Constitution.
You're wrong.
You need both Congress AND the President to wage a successful war. The President commands the troops. Congress funds the effort. Can't have one without the other, though each may try.
The President can command the troops to wage war until the money runs out. Then he needs Congress to fund the effort. Congress can declare that they want to fund a war, but they will get nowhere with out a CIC to wage the war.
That is what a system of checks and balances is all about.
That's the simplicity of the Constitution.