Because the remaining workers had more tools and land to work so they became more productive so they produced more. When workers are working harder employers are willing to pay more.
What happend to the Texas settlers when Santa Anna gained power? well the Santa Anna army marched into the almo on march 6th and 1836 and the Almo fell after 13 days seige
Germany lost both wars while Japan only lost WWII.
It was actually a city state at first, Through conquest, trade deals, and luck/resources. They were able to become an empire. Also reorganization of the Roman Legion helped.