What was the real reason for prosperity in the 90's?

The economy is cyclical. There is no such thing as continued prosperity, as this would lead to the complete collapse of the monetary system. Up until our current joke of a president, former presidents had very little effect on the economy, contrary to what they might say when it is good. A president would really have to go out of his way and implement some severe policies in order to screw the economy up. (Obama has found a way to do that)