What was the defining moment for the Allies in WWII?

In ohio in 1872, the cleveland massacre was a violent labor dispute at standard oil refineries in cleveland. a takeover by standard oil of the refineries in cleveland. an attempt to stop standard oil from becoming a monopoly. a failed attempt by standard oil to take over other refineries.

The annexation of bosnia and herzegovina by austria-hungary in 1908 caused serious bitterness between serbia and austria-hungary.

Even though the u.s. was not at war roosevelt met with great britain to sign this secret pact that neither country would seek territorial gains after the war. a atlantic charter c. potsdam charter b. yalta charter d. london charter