The previous event occurred. The economic slump in the United States periodically since the 18th century, mainly because the local level economic deficiencies that are not very serious and in no time.
Previous events The economic downturn in the US periodically since the 18th century, mainly because of local economic conditions that are not very serious and result in no time.
Before the event. The economy in the United States down periodically since the century 18 mainly because of the economic level not very serious local signal and in no time.