>>212815137>Are there any real-world examples of such a state in the modern age?Japan was probably the last one, but Americans forced their way in with huge ships and naval cannons. Japan refused all foreigners until America just rode up with their huge navy and started shooting up their port towns with cannons until the Japanese were forced to open up their country a gunpoint.
Any other country left that hasn't been explored has been left alone because it has no value. Like those hidden tribes in the Amazon rainforest. Or random tribes living in isolation on random islands in the pacific ocean.