Short Term Effect - 1948 War (more significant cause)

What happened on 14th May 1948?

David Ben-Gurion declared the creation of Israel as the British Mandate ended.

what did the declaration follow?

the declaration followed the UN Partition Plan, but sparked immediate conflict.

what did Armies from Egypt, Jordan, Syria, Lebanon, and Iraq do, and what was their goal?

Armies from Egypt, Jordan, Syria, Lebanon, and Iraq invaded the next day. Their goal was to prevent a Jewish state and secure Palestinian Arab territory.

what did Arab forces do wrong in the war?

Arab forces were poorly coordinated, with each country pursuing its own interests.

how did Israel react to the Arab forces not fighting well

Israel not only survived but also expanded its territory to around 77% of former Mandate Palestine.

what happened to Jerusalem

West Jerusalem under Israel, East Jerusalem (including the Old City) under Jordan

When and how did the war end?

The war ended in 1949 with armistice agreements (not a peace treaty).