Thursday, October 19 marked the deadline for cities to apply to become the home of Amazon’s second corporate headquarters, a $5 billion project that is expected to eventually employ 50,000 people with average salaries of more than $100,000. The competition, which the company announced last month, sparked a bidding war that demonstrated the growing importance of ecommerce and logistics to the nation’s economy and that allowed many parts of the country to tout their infrastructure assets and, in some cases, to recognize the infrastructure challenges they may need to face in the future.