German unrestricted submarine warfare ultimately resulted in the U.S. joining the Allies during WW1 in 1917. The use of submarines was a violation of U.S. neutrality, and it went back on the promise Germany made in the Sussex pledge.
The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The central idea of "Courage in Denmark: Resistance to the Nazis in WWII" is that Denmark was the following.
The only nation captured and occupied by the German Army that resisted, by all means, the attempts of the Nazi troops to deport D*nish Jews to take them to concentration camps.
D*nish people were so brave, knowing that they were risking their own lives providing shelter to Jewish people, knowing that this could represent a major punishment, including death.
Let's remember that during the Holocaust years in World War II, the Nazis persecuted Jewish people to send them into concentration camps to later kill them in the gas chambers.
Countries such as Switzerland, Norway, Sweden, and Denmark always maintained a foreign policy of neutrality, never taking the side to support the Germans or the western allies.
Answer:
A bill of rights for those living in the territory
Rules for the entry of states into the union
