Answer:
The launch of Sputnik a Soviet spacecraft.
an identured servant is someone who signs themselves away for a number of years to earn money
It would be described as Battle of the Atlantic, in World War II, a contest between the Western Allies and the Axis powers (particularly Germany) for the control of Atlantic sea routes. For the Allied powers, the battle had three objectives: blockade of the Axis powers in Europe, security of Allied sea movements, and freedom to project military power across the seas.
