Final answer:
The phrase coined by Winston Churchill in 1946 to describe the diplomatic alliance between the U.S. and England is the Atlantic Charter.
Step-by-step explanation:
The two-word phrase coined by Winston Churchill in his post-WWII speech in 1946 to describe the diplomatic alliance between the U.S. and England is the Atlantic Charter. The Atlantic Charter was an agreement that articulated the goals and objectives for the world after World War II. It was negotiated by British Prime Minister Winston Churchill and U.S. President Franklin Roosevelt.