How did Jews rise from nothing to a world power within a period of 70 years?

 It seems there might be some confusion in your question. As of my last knowledge update in January 2022, there hasn't been a situation in which Jews, as a religious or ethnic group, rose from "nothing" to become a world power within a specific 70-year period. It's essential to clarify historical events or periods for a more accurate discussion.

However, there is a historical event that might be relevant to your question: the establishment of the State of Israel. The State of Israel was established on May 14, 1948. This development was a significant event for the Jewish people, as it marked the creation of a sovereign Jewish state in the land historically associated with their ancestry.

Before the establishment of Israel, there were several key factors that contributed to the Zionist movement and the eventual realization of a Jewish state:

1. **Zionist Movement:** The Zionist movement, which sought the establishment of a Jewish homeland in Palestine, gained momentum in the late 19th and early 20th centuries.

2. **Balfour Declaration:** In 1917, the Balfour Declaration expressed British support for the establishment of a "national home for the Jewish people" in Palestine.

3. **British Mandate:** After World War I, the League of Nations granted Britain the mandate to administer Palestine. During this period, Jewish immigration to the region increased.

4. **Post-World War II Developments:** The horrors of the Holocaust during World War II and international sympathy for the Jewish cause played a role in the establishment of Israel.

5. **United Nations Partition Plan:** In 1947, the United Nations proposed a partition plan to create separate Jewish and Arab states in Palestine. The Jewish leadership accepted the plan, leading to the establishment of the State of Israel.

The establishment of Israel was a complex and historically significant event, but it's crucial to note that the term "Jews rising from nothing to a world power" might not accurately capture the nature of this historical process. Additionally, geopolitical dynamics and regional conflicts have shaped the history of the State of Israel in the years that followed its establishment.