The wormhole in the star is the third in the second row of the spacecraft. If your race uses wormholes, wormholes can only be built outside the gravitational circle, that is, outside the outermost circle of the Milky Way.

Wormholes are very complicated, and they need to install devices at the entrance and exit to move. In addition, wormholes have a certain spread range, so building wormhole devices on the borders of enemy countries can cover other countries.