What did the government do to help with problems in the cities that were declining?

Other times, it can be simple life cycle effects from civic aging, or just plain bad ... Part of the problem is that growth and decline are both positive feedback processes. ... As people and businesses leave, a city government's fixed costs

Explanation:

The 1st american volunteer group (avg) of the chinese air force in 1941–1942, nicknamed the  flying tigers , was composed of pilots from the united states army air corps (usaac), navy (usn), and marine corps (usmc), recruited under presidential authority and commanded by claire lee chennault.