The Indian Nations did not focus on interstellar colonization before The War. Many of their people left of course, just as many people of every nation went to the stars. But the nations themselves never focused on leaving Earth. If the White Man wanted to leave Earth, the Indians were happy to expand their influence in their old homelands. Then the fall of Yosemite Station killed a larger percentage of Indian citizens than almost any other demographic group in America. The Free Japanese had it even worse. It was a wakeup call to all of them. They had to slip the bonds of Earth and go beyond the limits of our solar system if they wished to survive as a people.