Final answer:
The first summit between Roosevelt and Churchill occurred in Newfoundland in August 1941, which resulted in the Atlantic Charter.
Step-by-step explanation:
The first summit meeting between President Franklin D. Roosevelt and Prime Minister Winston Churchill took place in Newfoundland in August 1941, before the United States had entered World War II. At this meeting, they produced the Atlantic Charter, setting forth their postwar vision for the world. It is essential not to confuse this first summit with other subsequent meetings such as the ones in Casablanca, Tehran, or the known conferences in London and Washington D.C., where significant war strategies and postwar plans were also discussed.