What has been the MAIN reason for the high degree of tension between the United States and Iran in recent years?

Question

Quizplus · Accepted Answer

The pursuit of nuclear weapons by Iran has been the main reason for tension between the United States and Iran. The United States and other countries have accused Iran of using its nuclear program to develop weapons, while Iran has denied these allegations and claimed that its nuclear program is for peaceful purposes only. This has resulted in economic sanctions and diplomatic isolation of Iran by the United States and its allies.

What Has Been the MAIN Reason for the High Degree