BACK TO THE MOON
We colonized the Moon first. Despite all the rave back then about colonizing Mars and putting civilians (read guinea pigs) on Mars. After several psychological evaluation, and putting people in temporary cryogenic sleep. They spent 50 years, and billions of dollars. NASA was privatized by then, so tax payers couldn't complain. It was an international global effort. But you already know the end result. Humans, no matter how anti-social they are, no matter how much discipline, how much distraction (exercise, work, entertainment: TV, games), need other people, and need plants, and something to do and a sizable personal space, sunlight, and gravity.
So while it's survivable in the short-run, in the long-run, it was an impossible project. Instead a second program to colonize the Ring. An area forming a ring around the moon, between the Faceside and the Farside of the moon.
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LUNAR-EARTH INTERDEPENDENCY
"To live on the faceside is to see a comfortable world where our cousin are, and where we will never return."
The Lunans never colonized the face side. Unlike Mars, who can train everyday to prevent osteoporosis, the Lanans, who live so earth but can never return to the home planet, especially born Lunans.
Unlawfully taken from Royal Road, this story should be reported if seen on Amazon.
At the same time, the Lunans are the biggest exporters of plant base foods to both Mars and Earth. This economic interdependence between Earth and Mars, held the League of Planets together, albeit vicariously.
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OSTEOPOROSIS & GRAVITY (Don't know why I am so obsess with this topic.)
The lack of gravity, we spend all our time, trying to maintain bone density by exercising all day. When we are not exercising, we are either eating, sleeping, or maintaining the facility. What little entertainment, is left in 1 hour during exercising. While exercising, we listen to the news, get updates on our to do list. hear progress on who else on the moon is doing what. making business calls to get shipping lines. We are also minimalist when it comes to stuff, and hoarders when it comes to breathable air converters, food, and power, and money, for obvious reason.