Take the first Arab-Israeli war (1948). Arab forces from Egypt, Transjordan (Jordan), Iraq, Lebanon, Syria, and Saudi Arabia united against Israel. In the second Arab-Israeli War (1967), also known as the Six-Day War, the same five Arab nations united against Israel. This time, however, Algeria, Kuwait, Libya, Morocco, Saudi Arabia, Sudan, Tunisia, and even Pakistan supported the Arabs against Israel. In the Yom Kippur War of 1978, Egypt and Syria, supported by Iraq, Jordan, Algeria, Morocco, and Tunisia once against united against Israel. In none of these conflicts, however, were all the Arab states as united as they currently are against Iran.
Even in the current and divisive conflict in Syria, only five Arab nations - Jordan, Saudi Arabia, Bahrain, the UAE, and Qatar - sought coalition airstrikes against the Assad regime.
The Islamic Republic of Iran’s ability to unite all the states in the region against itself is truly exceptional. Imagine what the world would be like if Iran used this unique ability to combat regional terrorism and made the region a better, safer, and more stable place.