When the constitution was written, the signers compromised and decided that at a date 20 years from then, the slave trade would end. this would mean that no more slaves would be imported, however, all slaves already in the states would remain slaves. it would have at least been a step in the right direction. the date was not met, and was merely ignored until the civil war broke out.
The assassination of Arch Duke France Ferdinand.
A) regulates the oil production and supply on the world's market
In the short term, the Organization of Petroleum-Exporting Countries (OPEC) has significant influence on the price of oil. ... For example, if OPEC countries are unsatisfied with the price of oil, it is in their interests to cut the supply of oil so prices rise.
Without you providing us with the diagram, I can still offer you some thought about the effect of the Smoot-Hawley Act and protective tariffs. Sponsored by Senator Reed Smoot and Congressman Willis Hawley, the intent of their tariff act was to protect American jobs during the economic crisis of the Depression. However, when the US imposed protective tariffs, other nations retaliated with tariffs of their own. Thus American exports and imports were cut in half and the Depression grew worse, not better.
We should note this too: While economists agree that Smoot-Hawley worsened the Depression, how large of a factor it was is a matter that economists debate. Some say the tariffs played a minor role compared to other aggravating factors of the Depression. However, the Foundation for Economic Education asserts that the economists who want to minimize the role of the Tariff Act are wrong to do so. Underestimating the negative impact of protective tariffs can be very dangerous economically -- then and now.