Many jews were prevented from leaving germany because..

Some countries refused to accept them during the Great Depression.

Explanation:

The Great Depression (1929) had left many unemployed people all around the world, feeding antisemitism, nativism, and xenophobia even in democratic countries. Furthermore, Nazi policies had taken much of the Jew´s wealth, and not many countries were prompt to take in vast numbers of broke immigrants.

a. competition between france and england for land and power