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I guess it depends on what you consider civilization. Authority has existed for as long as life forms have had to compete for control of resources. Chickens have among the highest social power structures of authority of any species, humans included. But we don't consider chickens all that civilized.
Trade systems have existed since pre-sapiens, with at least Neanderthals (possibly the aforementioned denisovans, though far less is known about them) were hunter gatherer tribes occasionally bumping into one another trading skins and tools for food, and once we grew up big & strong, between the intelligent species, surviving some harsh climates...
The modern materialist notion of western marriage as accepted by the US government eliminates an awful lot of otherwise would-be civilizations. Magellan could tell you a thing about that, when they came upon sharing-based societies. ...and it's not even universal in our own country. It's a fairly modern invention, and a fairly shoddy, coming from unscrupulous roots and heading to an ugly end. It's well that it's lost much value as we've matured a bit.
If you consider civilization as many anthro's do, a site of communal residence intended to be permanent, we've been doing that since before we were humans, on Africas great rift. So too as hunter gatherer tribes, as with earlier hominids. The neolithic revolution (agricultural revolution) is often looked at as a conveniently recent date of mankind's attempt through plant and animal domestication to create a society that becomes a self-sustaining organism in its own rite. This happened in the fertile areas in south & southwest asia, (esp present-day India) first, roughly 10,000BCE, before building up villages and cities in the millennia that followed. But it was about 7000 BC when cities allowed some people to win big and live sedentary lives, by convincing the majority to do the work, enabling economies, armies, and power struggles to flourish, essentially creating the modern civilization. The look of civilization has changed slightly, but if you read what Ashok and Cyrus were dealing with in early civilization, it shows you how far we haven't come in all this time.