Send Me to Marry You, and I Will Build an Empire. Why Are You Panicking?

The fourth prince who was reborn in the Dawu Empire. Awakening the breath-strengthening system, you can gain ten kilograms of food and grass in one breath, and increase your troops by one person. There are even various generals available for exchange. But at this time, the empress wanted to send the prince to make peace with the enemy country. Zhang Tian was unfortunately chosen as the marriage partner. The master of great achievements was abandoned to an enemy country, married the princess of the Southern Barbarian Empire who had been ill for several years, and finally proclaimed himself king and emperor. But when Zhang Tian was building the empire, why did the empress regret it again?