U.S. stock futures tumbled on Wednesday following Tuesday’s advances. Futures of major benchmark indices were lower.The indices dropped as the U.S. federal government officially entered a shutdown at 12:01 a.m. on Wednesday, Oct. 1, after Congress failed to reach an agreement on a spending plan. However, historical data suggests that these events are often short-lived and have a limited long-term impact on equities. Meanwhile, the 10-year Treasury bond yielded 4.15% and the two-year bond was at 3.60%. The C ...