One potential congressional tool for ending a war is cutting funding for the war. negotiating peace treaties. replacing the secretary of defense. canceling weapons system orders. sending an ultimatum with unanimous signatures to the president.

According to the references such as books and sites that I've read, I came to a conclusion to your question. The answer to the question "One potential congressional tool for ending a war is..." is "cutting funding for the war".

“destroyers for bases agreement in the destroyers for bases agreement between the united states and the united kingdom on september 2, 1940, fifty caldwell , wickes, and clemson class us navy destroyers were transferred to the toyalbnavy from the united states navy in exchange for land rights on british possessions.” i hope this you .