If the USA could have, 20 years of peace - which it never has had, the USA could be transformed, and most of its problems solved.
Philippine–American War (1899–1902)
World War I (1917–1918)
World War II (1941–1945)
Korean War (1950–1953)
Vietnam War (1965–1973/1975)
Persian Gulf War (1990–1991)
War in Afghanistan (2001–2021)
Iraq War (2003–2011)
Iran War (2026–present)
