With the U.S. government partially shutting down over the weekend, will the stock market’s nearly uninterrupted march higher also come to a close? The federal government shutdown is poised to stretch into a third day Monday as negotiations over immigration continued to roil Capitol Hill. This outcome has added another element of political uncertainty to a market that already has a lot of it—most notably with tensions between the U.S. and North Korea, and with Special Counsel Robert Mueller’s investigation into alleged Russian meddling in the 2016 presidential election. Investors may not need to worry too much, as past shutdowns haven’t corresponded with significant stock-market selloffs. Data show that markets have seen modest weakness during shutdowns, with the S&P 500 SPX, +0.44% falling an average of 0.6% over the period of the closure, according to data from LPL Financial. The benchmark index was only positive in 44.4% of the 18 shutdowns going back to 1976. via