Transportation, cultural norms, business interests, technology, and government - these are the significant turning points from city life to suburbia, according to Kenneth Jackson. However if we reflect on history, we can see that all major events seem to rotate around one of these factors.

Discovery of America = transportation, business interests, government.
Taming the American wilderness to Colonies = transportation, cultural norms, government.
Gold Rush = transportation, cultural norms, business interests.
The Great Depression = cultural norms, business interests, technology, government.
Flying a man to the moon = transportation, technology, government.
Computer and Internet Boom = Cultural norms, business interests, technology, government.
Any major war = transportation (oil), business interests, technology, government.

Although these events in history vary, they can all relate to the ignition of at least one of Jackson's five factors. And it begs the question to wonder what is not in the reach of human interest or passion, until one of these five factors begets a path to its fruition.