We now have vaccines, technology, and text messages. How have these new things changed American history?

Freedom of religion, freedom of speech, being protected by our military and first responders on a daily basis and many many more. 

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.