Why did Otto Frank wait so long to try to get his family out of Europe?

Otto Frank was the father of  Anne Frank and Margot Frank. Otto Frank was the only survivor of the family. He was a spice businessman so he used to travel a lot.

Otto Frank and his family tried to move to the United States but it was taking too long and at that time world war II started which had made things worse.

Otto frank tries to escape from Cuba but Germany revoked the nationality of the Jews living outside of the country which leads to the cancellation of the immigration application.

These were the scenarios that lead to the delay in taking his family out of Europe.

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.