<span>It is false that prices rise when supply of a commodity exceed demand. It is a basic rule of supply and demand that when there is more demand for a product or commodity then there is supply the prices will rise, and vice versa. In other words, when there is more of something than people want, the price will fall, and when there is less of something than people want, the price goes higher.</span>
The tariffs made imported goods very expensive and was an attempt to protect Americans from losing their jobs (because they would produce the goods domestically).
The tariffs failed miserably and probably were one of the reasons for the Great Depression.
No, it is false that Imperialism was the name given to the idea that Americans should expand across the nation to the Pacific Coast, since what you're referring to was known as "Manifest Destiny".
-15e+7-5e-9
For get about the - sign and add the 15 and 5
Then place the -sign back
Add 7 to the -9
-20e-2