Interstellar Trade is Possible Part III: Threats, Strategy and Evolution

Interstellar trade does not happen in a vacuum.

The colony will be face multiple threats, to be defended against as it evolves into a more and more significant part of human civilization.

Interstellar Trade Is Possible Part II: Travel

This is Part 2 of the series focusing on realistic Interstellar Trade. 

Here we will look at the various propulsion systems available and discuss which are appropriate in different settings and futures.