What were the origins of Arab nationalism and does it still exist in the modern world today?

What were the origins of Arab nationalism and does it still exist in the modern world today?
Discuss Gamal Abd-Al Nasser and Arab nationalism, and its origins. (within this include the use of his propaganda through radios and broadcasting)
Secondly, mention the effect of pan-arabism at the time on the rest of the remaining Arab countries.
Thirdly, mention pan-arabist movement and the Gamal Abd-Al Nasser’s motivation for helping Palestine during the Arab-Israeli conflict.
Fourthly, mention the decline of Arab Nationalism/pan arabism and reasons.
Fifthly, mention if Arab Nationalism exists or does not exist the in modern world and provide reasons.