The Exchange Button for Minor Company 1 should be disabled until the Prussian Can Form.
The Exchange Button for all other Minors and all Privates should be disabled until the Prussian Has Formed.
The Prussian can be formed after the First 4 Train is bought, and the 2 Trains have been rusted. This is Phase 2.3. Disable unless this phase has been reached.
The Exchange Button for Minor Company 1 should be disabled until the Prussian Can Form. The Exchange Button for all other Minors and all Privates should be disabled until the Prussian Has Formed.