This is two distinct questions. Please see these Related Questions which answer the two parts of the question:What is the Arab-Israeli Conflict about?What are the causes of the Arab-Israeli Conflict?
It is not about a "who" but about numerous "whats". To discover the causes of the Arab-Israeli Conflict (i.e. the "whats") see the related question below.
The Arab-Israeli Conflict has mostly been kept within the southern Levant region and northeast Egypt.
As counter-intuitive as it might be, the two groups involved in the Arab-Israeli Conflict are the Arabs and the Israelis.
the israeli believe that israel is there promise land
The British Departure from Mandatory Palestine, the Establishment of the State of Israel, and the Palestinian Arab Exodus during the 1948-9 Arab-Israeli War are some of the most important events in grounding the Arab-Israeli Conflict.
The majority of conflicts the world-over are over territory. It makes sense that the Arab-Israeli conflict is over territory as well. It would be surprising if it were not. To read about other causes of the Arab-Israeli Conflict, see the Related Question below.
Jerusalem.
Which country?
The causes for the Arab-Israeli Conflict have not changed since 1973. Please see the Related Question below.
Somalia has no role in the Arab-Israeli Conflict, but like most Muslim-majority states, refuses to recognize the State of Israel.
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