Because you could just sit in your trench and wait for the opponent to attack, at which point you could shoot him, throw explosive devices, or even use chemical weapons that weren't banned then.
the French and the British/colonies
Answer:
Correct answer is It shifted US Policy towards imperialism.
Explanation:
Second option is the only correct as it marked the expansion of United States. United States decided to spread their influence outside American continent, which put them in the line of great imperial forces.
All other answers are therefore wrong, as they are not expressing the attitudes of the American government at the time.
