Orbital Blockade

… lies deep inside what was considered First League space two million years ago, and it appears to have been either a major colony or the homeworld of a species described as "non-compliant" in surviving League records. The two parties appear to have been engaged in some kind of trade war, and the League's Grand Navy maintained extensive blockades of the … on at least two separate occasions. Orbital debris indicate that the blockades were violently challenged several times.

The command below will trigger the "Orbital Blockade" event in Stellaris:

When this event fires, you can choose between the following option:

• Curious.
  • Start special project: Orbital Blockade