Two.
Polk acquired the Southwest by war with Mexico. McKinley acquired Puerto Rico, Guam and the Philippines by war with Spain. Monroe acquired Florida from Sain by military force, but war was never declared.
In addition, virtually every 19C President acquired land as a result of Indian wars.
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It was acquired after the Revolution when the United States got all the land from the Atlantic Ocean to the Mississippi. They also got land from the Louisiana purchase and from the war against Mexico.
There were 5 u.s presidents during the cold war
Quite a lot of presidents have been elected directkly or indirectly because of war, but the obvious cases are Washington, Grant and Eisenhower.
Declaring war is not one of the president's powers. Congress is the only one to have the power to declare war.
A formal declaration of war.