The North Korea nuclear test over the long labor day weekend in the U.S. is exactly why we try and close out of all long positions over the weekend news
September is historically the worst month of the year for the S&P 500 and Nasdaq which is why I view recent buy signals with skepticism.
The S&P 500 percent of stocks
Since the 1950s, a stock market correction of -13% is the average draw-down that happens each year. In an article on ETF (link above), Ben Carlson of Ritholtz Wealth Management