The S&P 500 (^GSPC 0.78%) returned more than 25% during the three-month period ending on July 9, marking the sixth time in history the index has accomplished that. Interestingly, not only has the S&P 500 always been higher one year later, but also it has returned an average of 21% during the subsequent year. In short, history says the stock market is about to soar, and most Wall Street analysts who follow The Trade Desk (TTD 3.67%) and Pure Storage (PSTG 2.62%) have buy ratings on the stocks. Here's what in ...