By the year 1870 to 1939 is the most important?

One of my friends is a fan of world history and world geography (NO History United States, important!) And I want to get an atlas of your age, your copy as a gift. Now, I have found many of them, and I can get any year between 1890 and 1939 … a year in that range, which means 50 different options. For an amateur world history and geography, that Atlas year, give the most wow? I want the map showing most change the look of today. You choose, what year? Thank you! Please reply as soon as possible, the auction, the seller of books is 2 days away.

I think that 1914 would give proper perspective. Polls show the history of Europe during 1815 -1914 to the 19th century also, 1911 was the formation of the Republic of China. I think 1914 would be the interesting point of view is the preparation of Czechoslovakia was formed, yet separate provinces of Yugoslavia, Serbia was independent.