How do stars propose the Federation?

The steps to propose an alliance in Stars are as follows:

1. Select the "Federal" tradition in the "Diplomatic" tradition tree on the "Tradition" page.

2. Select the countries you want to invite to join the alliance, and select "Form Alliance" in the interface to communicate with them.

3. Adjust the federal category in the "Diplomatic Action" interface that pops up, and click "Accept" in the lower right corner.

After completing the above steps, the Federation can be successfully established.