In terms of groups of people?
Native Americans
The German Use of submarine warfare caused tension to increase between the United States and Germany. Their submarines were called U-Boats.
Answer:
Correct answer is It provided valuable experience for the officers.
Explanation:
French and Indian War lasted for seven years and served as a valuable experience for officers of Continental Army. Israel Putnam, George Washington and many others participated in this war and were already seen as veterans who knew how to fight in war.
All other options are therefore false, as not only that it did not weakened them, but it strengthen their skills.