It was never decided that “money is speech”; that’s just the kind of oversimplification that people use to rile you up. What was decided was that _spending_ money _can_ be speech. For example, if you spend money on a hot dog then that probably wasn’t an act of speech covered by the first amendment, but if you spend it on a television commercial then it probably was.
The entire government operates on the principle that there's implied rights in order to make the system actually work.
There's no power to classify information in the constitution. It's implied by the fact that the country has to be able to operate a military.
The 1st amendment doesn't say anything about money. But it's been decided that money is speech.
We could go on and on.