In fact the swept wing design of the Boeing B-47 was influenced by german designs as well, that's according to Boeing:
Near the end of World War II, Boeing aerodynamicist George Schairer was in Germany as part of a fact-finding mission. At a hidden German aeronautics laboratory, Schairer saw wind tunnel data on swept-wing jet airplanes and sent the information home. Engineers then used the recently completed Boeing High-Speed Wind Tunnel to develop and design the XB-47, with its slender 35-degree swept-back wings.
https://www.boeing.com/history/produ...stratojet.page