Answer:
Arab countries
Step-by-step explanation:
After WW2 the Jews who were practically exterminated were offered to create their own state.
The problem was that in the region where they created their country they were opposed by locals. That is why practically all the countries that are represented in the Arab League, including Morocco, Iraq, Tunisia, Libya, Algeria, Syria etc. Also, one of the main opponents is Iran, who is still engaging itself in conflicts against Israel.
Of course, this is seen both as a religious and political conflict. While Israel has a support of United States, Arabic countries are relying on Muslim countries in the region.
This conflicts started after the creation is Israeli state.