Answer:It will require the United States to spend money to defend the islands
Step-by-step explanation:
Carnegie thinks that occupying the Philippines will cost the United States money because It will make the United States spend money to protect the islands from foreign attacks.
In his quote he says that “Certainly they will be a grievous drain upon revenue if we consider the enormous army and navy which we shall be forced to maintain upon their account. . . .” A grievous drain upon revenue means that the taxpayers’ money will be destined or wasted in trying to keep an army and navy in such a far away place.