 Complete the following phrase:  Future Emperor Quang Trung, along with Nguyễn Nhạc and Nguyễn Lữ, had successfully united all Vietnam after a century being divided between the Trịnh Lords and Nguyễn Lords. Following with it, the Vietnamese also successfully crushed the Siamese at the Battle of Rạch Gầm-Xoài Mút and decisively, the 