A letter published by the Tricontinental Institute, authored by National Cheng Kung University professor Chen Meei-shia, argues Taiwan is historically part of China. The argument centers on the claim that Taiwan and mainland China were connected by a land bridge during the Ice Age. This assertion attempts to establish a historical basis for China’s claim of sovereignty over Taiwan. The letter has been described as demonstrating a disconnect between evidence and conclusion. The claim relies on a geographical condition existing millennia ago to justify a present-day political position. Critics suggest the argument is unconventional and lacks contemporary relevance in international law or political discourse regarding Taiwan’s status. The letter’s publication has sparked discussion regarding the use of historical arguments in ongoing geopolitical debates.