An Historian Specializing on the world history explicitly utilized Kemp's sport analogy to modern day empires. The global closure c.1900 marks the point when empires finished their "typical period" and entered "Perform-offs. This section requires supplemental citations for verification. Be sure to enable boost this article by introducing citations to https://louiszefkn.dm-blog.com/35151645/the-ultimate-guide-to-29empire-com