Population happiness

I need help. I’ve been trying to boost the people’s happiness on Colony E, including keeping the population high so all of the buildings can keep functioning, making sure the unemployment rate is minimal and even adjusting the climate.
What do I do?

Build entertainment centers. Some buildings give a negative effect to happiness. The entertainment centers add to happiness so add a few of those and you’ll be good for now.

What demo said.

You’re going to have riots before long.

Click on the (i) icon by the happiness, and it should show you what the impacts are. My guess would probably be either corruption, or too many buildings that decrease happiness.