Answer:
“The foreign secretary wanted to be certain that this message reached von Bernstorff”
“he made arrangements for it to be carried aboard a U-boat”
Step-by-step explanation:
This is a passage from "The Dark Game", Paul Janeczko's novel about espionage that took place throughout the history of The United States.
The passage describes the hardships that Germany faced during the World War Two. As Germany was loosing the war in 1917, their tactic was to find allies. Mexico, being close to the United States of America, was a great ally.