At the eleventh hour, on the eleventh day, in the eleventh month of 1918, germany agreed to a cease-fire and signed the___, or truce, that ended the war.

Armistice is the word that goes into the blank.

Explanation:

The official truce that ended the war wasn't the Christmas Truce of 1914, but was the Armistice in 1918.

Probably to keep track of them so they could monitor their numbers. Keeping them together made it easier for the germans to kill lots of jews at once and it made it easy to test things on large groups of people.

Idk if that was helpful but I tried.