This has always bothered me. How was there this weird, global near-consensus that kings/queens/shoguns/emperors are the way to go?
hi! there's lots of room for more info on this, but you may get some ideas from these sections of the FAQ
You'll also get some good answers at /r/askanthropology, as it might be more up their alley.
The idea that the consensus of the people is what forms governments is a very modern idea (at least as a wide spread idea among common people), and in many ancient societies the idea of common people having any ability to change what the government looks like would have been nearly non-existent.
The structure of aristocracies and monarch were not something that the people "decided" would happen. They were the natural development of warlords and generals taking control of territory and the claiming complete power over it. Those that opposed them were killed and the loyal survived and prospered. Over time these became codified into different positions we would think of as King, Duke etc. Although it developed in a myriad of different forms around the world.
If you look through the FAQ section you should be able to get a good idea for why Monarchies tended to dominate and how they first came about.