When was this document written? What was Halifax’s purpose for writing it?

BELOW:

Lord Halifax, he states there was simply no alternative and Britain has exhausted all other choices. In addition, Chamberlain's practice of appeasement was criticized because, according to Document B: Churchill, he says that France and the other countries could have stopped Hitler at the seizure of Austria if they had worked together

whose power in the senate is equal to the power of the speaker of the house?