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.

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.