Manteca has teetered on the edge of bankruptcy three to four times in the past 40 years.Each time the city has laid off workers.Nice story line. Too bad it isn’t true.Manteca is not - and never has been - on the threshold of filing bankruptcy despite the story some history revisionists are busy spending these days. Yes, Manteca has laid off workers and that was during the recent economic downturn considered the worst since The Great Depression.Other times since 1970 they simply let positions remain vacant when people retired or changed jobs.