How does the game Civilization 5 build a sub-city? How to enter the city interface?

Build immigrants, then order immigrants to go where you want to go, and click Build City to set up sub-cities. There must be at least two luxuries in the city location, preferably along the river or near the mountain, so as to get a better bonus in money and production capacity. If the location is close to other civilizations, you'd better pay attention to the geographical location. A city in Ma Pingchuan could easily be occupied in three rounds.

Enter the city interface? Just click on the city name. If you want to adjust the distribution of citizens, click Citizen Management in the upper right corner.

By the way, bonus: in the game Civilization 5, don't imagine that people won't commit crimes against me, and I won't commit crimes for peaceful development. No matter what form of victory, we need the necessary military support. It is most important that science and technology stay ahead or at least not fall behind.