What is sharted among the countries on the Arabian peninsula is that all of them have an arid climate and petroleum reserves, as well as some patches of desert. This is a common characteristic for the countries which exist there and is shared by all of them.
We were the most concerned about the containment of communism (second answer).
In case the president dies, resigns, is assassinated, or is impeached.
The amaerican civil war took place from 1860-1865