Attempts by Anne Frank’s father to escape the Nazis in Europe and travel to the United States were complicated by tight American restrictions on immigration at the time, one of a series of roadblocks that narrowed the Frank family’s options and thrust them into hiding, according to a new report released on Friday.

The research, conducted jointly by the Anne Frank House in Amsterdam and the United States Holocaust Memorial Museum in Washington, details the challenges faced by the Frank family and thousands of others looking to escape Europe as Nazi Germany gained strength and anti-refugee sentiment swept the United States.

Otto Frank, Anne’s father, was never outright denied an immigration visa, the report concludes, but “bureaucracy, war and time” thwarted his efforts.

In order to obtain a visa, Mr. Frank would have had to gather copies of family birth certificates, military records and proof of a paid ticket to America, among other documents, and be interviewed at the consulate.