The US and Soviet Union continued to reduce their stocks of nuclear weapons.
Explanation:
Détente is a term which means release of tension in French. It was applied to a time frame of improved US-Soviet relations that started provisionally in 1971 and important improvements were made when President Nixon leader of Soviet Union Leonid I. Brezhnev, in Moscow. He traveled to the Soviet Union in May 1972 and signed agreements incorporating the outcomes of the first Strategic Arms Limitation Treaty (SALT I) talks, and new efforts to expand further weapons control and arms control initiatives were begun. Both nations hope to benefit if trade could boost and the risk of nuclear warfare diminished.
Generally speaking, the act of formally approving something is known as "ratification"--which was famously the case when the individual states in the US had to "ratify" the new Constitution.
AnswerThe Safavids's rebellious habit is the most upsetting to Sultan Selim I because the rebellions weakened the Ottoman empire's control and authority