Counting Down the Ten Largest Empires in History, Nos. 10-6

For number 5 through number 1, click here.  10. Portuguese Empire (1815) – 10.4 million km2 (4.0 million sq mi) Portugal proper is not the largest country on the planet by any means, but its hold on a massive overseas colonial empire existed for nearly six centuries thanks to the maritime kingdom’s place at the…

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