The creation of interchangeable parts greatly changes the labor force during the 1800's. Interchangeable parts allows for a standard size of goods (clothes, furniture, etc.). Due to this change, the workforce transformed from a demand for skilled workers to unskilled workers. With interchangeable parts, there was no longer a need for individuals to make everything from hand. Instead, businesses were able to mass produce products with the help of unskilled workers. These workers were usually taught a specific, repeatable task. As long as the unskilled worker was able to learn this task, they would be able to keep their job. This revolutionizes the workforce for over 100 years, as the addition of the assembly line along with interchangeable parts results in the creation of products at a rate never seen before in world history.
There were a number of reasons Federalists opposed the Louisiana Purchase. One can assume some opposed it just because it was Jefferson who made the purchase, out of a kind of reflex. Others had heard wild stories about the land purchased, and thought the purchase a bad bargain. Some thought that the inclusion of Louisiana as the treaty was written would undercut the power of the states by not having each state vote, thus undercutting Federalist power. (Some Federalists in the eastern states specifically feared a shift in power to the west.)
http://www.enotes.com/homework-help/why-did-some-federalists-oppose-louisiana-purchase-21441
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Can you provide a picture ?
The correct reason is that Tecumseh was killed, which ended the possibility of a Native American confederation to oppose the United States. Hope this helps.
Placer mining was the most widely used method because it was affordable to a large number of prospectors.
