I Just Ascended the Throne! World War II Broke Out?

After waking up, wage slave Lin Mo discovers that he has somehow become the last emperor of a dynasty called the Great Xia Kingdom. He hasn't even had time to warm the dragon throne when a shrill air-raid siren sounds outside the Hall of Golden Chimes! [Global National Destiny Battlefield loading complete!] [Civilization competition begins! Every country will be randomly deployed to a vast continent, recreating the territories and armies from the height of its history!] [Modern technology is frozen. Only “psionic” weapons, combining historical and future technology, can be used!] [Global livestream begins. The fate of each nation rests on one person!] Lin Mo looks at the [Civilization Empowerment System] appearing before him, then at the Zero fighters roaring across the sky outside the hall and the Stars and Stripes of a joint fleet barely visible along the coast... He's stunned. Other people's civilizations: Roman legions, Mongol cavalry, Qin's elite troops... My civilization: the Republic of China, just out of its warlord era, with no industrial base and an army carrying Hanyang rifles?! This is hell mode from the start! Let's see how Lin Mo uses the System to conquer the ruins of neighboring nations and unlock the [Yanhuang Tech Tree], starting with the production of Type 56 semi-automatic rifles, then forming the “Psionic People's Liberation Army,” developing “rune industry,” and building “Xuanlong-class battleships”! When the Sakura Nation's psionic warriors clash with power-armored soldiers equipped with exoskeletons; when the magic-sailed battleships of the Empire on Which the Sun Never Sets are targeted by our army's electromagnetic railguns; when the Third Reich's undead Gustav super-cannon encounters our aerospace fighters in the “Nantianmen” project... the global livestream chat goes wild! “Wait! Weren't we talking about the late Qing and early Republic era? Why is there a Gundam...