Question

In 1900, which nation controlled more territory than any other imperial nation? Great Britain Japan Germany United States

Answer 1

It was Great Britain 

Answer 2

I would say that in 1900, Great Britain controlled more territory than any other nation mentioned including India, and many parts of Africa and some countries in the Middle East like Palestine (after WWI). That is why it was said that "the sun never rises or sets on the British Empire.