The British had THE BEST Navy, at the time, and as such were able to move quickly, to other countries, and take them without hesitation, as they came in fleets, carrying hundreds of soldiers! The...
It is difficult to answer. are you asking the biggest in size or in population and if in population it depends on the relative world population at that time. Any how, refer to links below for more...
No, their Empire was based on expansion into eastern Europe and Asia. There were no official colonies nor any territories that were once part of the Russian Empire that consider themselves to have...