American City Business Journals this week offers an in-depth look at small businesses in America. Our coverage includes an unveiling of our exclusive Small Business Vitality report: A ranking of 106 cities nationwide based on each city’s ability to foster the creation and development of small businesses. That Small Business Vitality ranking was unveiled on Thursday. Prior to that: On Monday: We looked at concentration of small businesses* — namely, the number of small businesses* (1-99 employees)…