Uneven; poor by u.s standards
The variable is y and y=2.
Answer:
The Revolutionary War (1775-1783)
War of 1812 (1812-1815)
Mexican - American War (1846-1848)
American Civil War (1861–1865)
Spanish-American War (1898)
World War I (1914-1918)
World War II (1939-1945)
Korean War (1950-1953)
Explanation: