There have always been Jews in Palestine. They were not the majority between the years 132 CE and 1949 CE.
The Exile of Jews from palestine is known as the Diaspora
Because Palestine keeps attacking the Jews.
no
No. Jews had already been migrating to Israel/Palestine in substantial numbers since 1919.
The declaration gave the Jews of Palestine the hope that they might one-day have a country of their own.
Diaspora.
no
they had part of palestine.
Sanhedrin
The Muslims and Jews both claim that Palestine is their land at that they have been living there for thousands of years. The Muslims do not have any proof of their claim, but the Jews do.
2000 years ago, after the death of Jesus, the Romans kicked the Jews out of Israel/Palestine. This period of time is called the Diaspora. In 1948, after WWII, the United Nations said the Jews could return to Palestine/Israel and have their own nation. The problem is in 2000 years, a lot of Palestine people moved into the land formerly occupied by the Jews/Israelis. So, you have a group of people, the Jews, who want to return to the land they taken away from by force 2000 years ago. You also have a group of people, the Palestine, who have lived on the land for the last 2000 years. Considering how much land was taken away from one group or another in the past, it is very difficult to give back all the land on the planet to it's original inhabitants. For example. a great deal of land in the USA was taken away from the Native Americans. It's obvious that the Native Americans are not going to get most of the land that taken away from them by force.
The British had to defend Palestine, much as border patrols defend every country now.