In fact, the seemingly favorable southern strategy of Qin Country has only begun to take shape in the last two or three years. The situation before was completely different and there was virtually no notion of a southern strategy for Qin Country.
First and foremost, before both Qin Country and Shu Country were vassal states of the Dahua Empire, and their mutual conflicts had to be under the control of the Dahua Empire. In terms of comprehensive national strength, the Dahua Empire significantly overpowered both Qin Country and Shu Country.
Even in modern times, although the national power of the Dahua Empire began to decline, it was still the largest country in the region. Neither Shu Country nor Qin Country, could afford to start a war under the pressure of the Dahua Empire.
Because if the Dahua Empire sided with the country being attacked, it could determine the outcome of the war, and thus Qin Country previously did not have the conditions to declare war on Shu Country.
