Important long term contributions of ancient greek and roman civilizations are primarily found in the area of "politics and government," since they were Republics in which people were represented in government.
1. Saddam Hussein, the leader of Iraq, was afraid the Shiite south of Iraq (rich in oil) would rebel against the Sunni Baath Party, which Hussein headed, because of the 1979 Islamic Revolution in Iran.
2. The Shatt al-Arab waterway was also another reason. The waterway caused much tension in the region because who controlled it had much influence in trade for the region.
An excise tax is are taxes that are paid when purchases on a specific good are made. An example of this could be the excise tax that's imposed when you purchase gasoline.