They Are Still Practicing Martial Arts, and I Have Mass-Produced Firearms

Lin Feng, a doctor of materials science from Tsinghua University, traveled through time and became an orphan who was about to starve to death in troubled times. He activated the [Industrial Civilization System] and started by burning pottery and selling salt. He led the ancients to set up technology trees, build muskets, and build factories. He used modern industrial civilization to reduce dimensionality and finally unified the seven countries and created a prosperous age.