二十世纪：1900年代：进步的种子 The 20th Century: The 1900s: The Seeds of Progress全集完整版免费在线高清观看

As the 20th century began, cities were still lit by gas lamps and Queen Victoria ruled an empire from the British throne. But before long, all this was changing, and this documentary, the first in a 10-volume series chronicling the entire century, focuses on how society, especially in America, underwent startling transformations. Relying mostly on archival footage and still pho...