In order to synchronize u. s. and british military operations around the world; and to speak as one about the need for convoy escort vessels, amphibious landing craft, and similar materiel, the two nations established the in 1942.

Joint Chief of Staff is the correct answer.

Explanation:

President Franklin D Roosevelt and Prime minister of UK Winston Churchill had decided to establish the joint chief of staff during Arcadia conference. The first chief of staff was George C. Marshall. He was named joint chief of staff at the onset of second world war. Marshall increased the size of the US army and devised the operation overlord in 1944. He also started the economic recovery program for the Europe which came to be known as Marshall Plan.

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a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )