Animal testing is controversial because animals are living beings, and potentially dangerous substances are tested on them which could cause death, mutation, severe injuries, posioning etc...
Answer:
The benefit of waiting to the end of the speech to ask the congress to declare a state of war was as a result of his need to enumerate all points which would point favourably towards the declaration of the war.
He knew that, making his request directly might likely led to being turned down while putting his reasons bare during the speech would grant him more grounds on why the war is a necessity.
Explanation:
