Who decided in the US about things such as our money's apperearance and denominations, the traffic laws, and education?

Traffic laws are, for the most part, local so local municipal governments.

Our money’s appearance and denominations was the Treasury Department with sign off by the Executive Branch.

Education was decided initially locally. There are now some requirements set up by the Department of Education to qualify school districts to receive federal funds, again, signed off on by the Executive Branch and Congress (who pass educational bills).

Well, the bottom line is you do (albeit indirectly)

In this country we have what is known as a representative democracy. That means that we elect officials ranging from our local city council members who direct policy on local level, usually covering things such as city ordanances concerning parking, enforcement of building codes, etc, to our state senators and congressmen who handle things on the federal level.

At the local level, most city council meetings are open to the general public and the general public is given the opportunity to voice opinions about issues at hand.

At all levels ranging from city to state, to federal you are welcome to contact your representative and voice an opinion on a particular issue, and since they rely on your vote to keep their job most of them have a vested interest in at least listening to what you have to say.

As for initially getting the ball rolling with regards to a particular issue, the process is pretty much the same. If enough people make their interest known to the appropriate representative then that representative might be motivated enough to sponsor a bill.

A conspiracy of the Illuminati.

@YoBob YES That is so true, and too many people give up their rights through inactivity.