Churchill was First Lord of the Admiralty when all Americans with tickets across the Atlantic were transferred to the Lusitania.

Simultaneously, due to requests by the British government, a full page warning by the Germans featuring a skull and crossbones was held up from being published until the day the Lusitania sailed.

According to the captain, telegrams arrived ordering him to turn the ship to pass close by the known position of a German Uboat.

All telegraph relay stations have two message numbers missing on that day, except one that deleted the text but recorded they were sent to the Lusitania.

This event caused the US to enter the war on the side of Britain.

The Lusitania was a disguised armed cruiser, owned by the British Navy. It was financed by the Navy and was never owned by the steamship line. It was loaded with war materials, and would have survived the torpedo, or at least sunk much more slowly had some not exploded. This has all been confirmed by examination of the wreck, which the British tried for many years to destroy with depth charges, but failed.

The captain was to be tried and convicted of gross negligence, but was acquitted by the judge, who was then disbarred by the British government as punishment.

None of this is conjecture or conspiracy theory, and has been pretty much admitted by the British crown, after the whole thing was published in the next to last issue of Life magazine.

The theory that Churchill knew of the attack on Pearl Harbor, but did not tell Roosevelt is much less likely, but impossible to prove or disprove. The US Navy had provided the British with the method of decoding messages in the JN25 code, but all records of British decoding efforts previous to the Pearl Harbor attack were destroyed.

Churchill was also very anti-Semitic, deliberately doing nothing to help Jews leave Europe. Roosevelt was also very anti-Semitic, having promoted anti-Jewish legislation in the United States, so between the two, many lives were lost.