Mostly farming, lumbering, fishing, trading,etc. This required cheap labor, or slaves. They were required for the heavy work to be done quickly by demand.
In 1644 the Chinese capital at Beijing was captured by the rebel leader Li Zicheng and desperate Ming dynasty officials called Manchus for aid
The three (ideas) that formed with the combination of suggestion of captain alfred t. manhan together with the convinced congress to pay for the construction of a modern american navy is the Published "The Influence of Sea Power", built large fleet ships, and imperialism.
Although the conflict divided tribes and villages, the war also saw the first extensive multi-tribal resistance to European colonization in North America and was the first war between Europeans and American Indians that did not end in complete defeat for the American Indians.
They were too large and expensive - typically a computer would fill a room and would have to have its own power supply.
