With tensions rising in Europe in the 1930s leading up to World War II, Britain recognized the danger of an aerial invasion, and thus developed an early warning system that was the beginnings of radar. A technological and strategic turning point in World War II for Britain and the United States, radar only continued to improve as the Allies gained the upper hand over the Axis. Having influenced the tides of World War II, contemporary radar became a technology that has played an integral role in scientific research, commercial industries, and the military sector.