The worlds colonial population at the time of the First World War totaled about 560 million people, of whom 70.0% were in British domains, 10.0% in French, 8.6% in Dutch, 3.9% in Japanese, 2.2% in German, 2.1% in American, 1.6% in Portuguese, 1.2% in Belgian and 1/2 of 1% in Italian possessions. The home domains of the colonial powers had a total population of about 370 million people.. Which countries had a bigger population the Japanese?