Forced to resign from teaching, Northen began to farm. After the Civil War, farming in Georgia needed reform. Northen set his sights on the Georgia House of Representatives, where he earned the trust of fellow farmers in the same situation as he. He uplifted the spirits of his fellow Georgians, who elected him to two terms in the state House, one term in the state Senate, and president of the Georgia Agricultural Society. He was elected to his first term as governor in 1890.