The next important event in Yukon's history was the construction of the Alaska Highway during the Second World War, which, after its badly needed reconstruction by the Canadian Government in the late 1940s, opened up the territory to road traffic. The Alaska Highway has played an extremely important role in the acculturation of the people. Today, the highway remains a scenic and well-maintained route throughout the year. The war also saw the construction of a number of airfields as part of the Northwest Staging Route. However, the influx of southern highway construction crews had a devastating effect on some First Nations, who suffered from a large number of deaths from diseases to which they had no immunity.