how did Isreal become a country?

Answer 1

When the UN in 49 or so decided in favour of Jews having a homeland. There was much sympathy due to the Holocaust and people claiming to be Jewish and their acts of terrorism against Arabs and the British.
I believe it depends if you see the change as the Jewish people gaining a homeland or the Arabs... losing theirs

Answer 2

G-d led Moses and the Children of Israel to the Holy Land after the Exodus from Egypt. From there, Joshua took over leading the conquest of the land as promised.

If you mean modern Israel, the world finally recognized the right of Jews to return to their ancestral homeland and voted in the nation in 1947 in a land that had not been a sovereign country since most of the Jews were driven out by the Romans centuries before. Even with the "expulsion", Jews remained a constant presence in the land. When Mark Twain visited the area, he wrote that the land was essentially abandoned, except for the Jewish areas. Jewish return began in ernest in the 1880's and the swamps were recovered and returned to productive farmland. As the Jews moved in, Arabs were drawn to the area by the jobs created by the Jews. In fact, until 1947, the term Palestinian referred to Jews returning to the land. The term was abandoned with the creation of the modern State of Israel and then stolen by the Arabs during the 1960's. When Israel declared itself a nation in accordance with the United Nations, it was attacked by seven Arab armies. They were defeated and the nation stood. I hope that helps.