This video is sponsored by Ground News. Download Ground News for free here: http://check.ground.news/Geographics → Subscribe for new videos two times per week. https://www.youtube.com/channel/UCHKRfxkMTqiiv4pF99qGKIw?sub_confirmation=1 Our sister channels: Biographics - https://www.youtube.com/channel/UClnDI2sdehVm1zm_LmUHsjQ TopTenz - https://www.youtube.com/channel/UCQ-hpFPF4nOKoKPEAZM_THw/ This video is #sponsored by Ground News. Source/Further reading: 4 hr podcast on the history of the