Final answer:
The rapid expansion of automobile ownership and the construction of interstate highway systems contributed to traffic jams and commuter crush after World War II.
Step-by-step explanation:
The rapid expansion of automobile ownership contributed to traffic jams and commuter crush after World War II. As more and more cars came into existence, more roads were needed, resulting in substantial construction of local, state, and eventually, interstate highway systems. The construction of the Interstate Highway System, which was originally intended to aid military deployment, also facilitated suburbanization and led to the destruction of urban working-class neighborhoods.