Here is an interesting paper which considers what would be required to build a spacefaring civilization.

SPACEFARING LOGISTICS INFRASTRUCTURE: THE FOUNDATION OF A SPACEFARING AMERICA  By JAMES MICHAEL SNEAD

Abstract
The American spacefaring dream, which envisions average Americans being able to safely and routinely travel to and work in space, remains the American public’s benchmark for measuring progress in America’s human space enterprises. This article begins with a brief review of the ideas and developments that led up to the formation of the American spacefaring dream in the late 1950s. It continues with discussion of how building new logistics infrastructure capabilities has enabled America to lead the world in opening new physical and technological
frontiers and why this provides a successful model for fulfilling the American spacefaring dream of opening the space frontier. The article concludes with the identification of specific planning objectives to guide the development, construction, and operation of an integrated American spacefaring logistics infrastructure.