If we had the resources of the cinema it would be interesting to show a map of North America year by year from 1600 onward, with little dots to represent hundreds of people, each dot a hundred, and stars to represent cities of a hundred thousand people.

• 如果我们有电影资料的话，展示一下 1600年以来北美洲年复一年的地图一定很有趣，可以用小圆点代表几百个人，一点代表100，星号代表拥有10万人口的城市。