The Price of Trump's 'Locked & Loaded': The 10 Costliest Wars in U.S. History
War.

As tensions between the United States and North Korea intensify, President Donald Trump on Friday took to Twitter (TWTR - Get Report) to announce that the military is "locked and loaded," prepared to respond if North Korea "acts unwisely."

Military solutions are now fully in place, locked and loaded, should North Korea act unwisely. Hopefully Kim Jong Un will find another path!

— Donald J. Trump (@realDonaldTrump) August 11, 2017

Although it can't be known if military action will be needed now, Trump said he hopes North Korea's supreme leader Kim Jong Un finds "another path," as a missile-driven war would be very costly.

The tension between the two countries was enough to send some aerospace and defense stocks soaring Friday. Would companies like Boeing (BA - Get Report) , Lockheed Martin (LMT - Get Report) , Raytheon (RTN - Get Report) and Northrup Grumman (NOC - Get Report) reach fresh highs if conflict with North Korea comes to a head?

The threat of war also sent investors fleeing to safe haven assets, weighing on the stock market and sending volatility to new records. The cost of war is enormous in every sense - but what does that translate to in dollars?

We take a look back at the 10 most expensive wars in U.S. history with price adjusted for inflation.

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Editors' pick: Originally published August 11.

10. Mexican-American War 1846-1848, $2.4 billion (tie)
10. Mexican-American War 1846-1848, $2.4 billion (tie)

10. Revolutionary War 1775-1783, $2.4 billion (tie)
10. Revolutionary War 1775-1783, $2.4 billion (tie)

8. Spanish-American War 1898, $9 billion
8. Spanish-American War 1898, $9 billion

7. Civil War 1861-1865, $80 billion
7. Civil War 1861-1865, $80 billion

6. Gulf War 1991, $102 billion
6. Gulf War 1991, $102 billion

5. World War I 1917-1918, $334 billion
5. World War I 1917-1918, $334 billion

4. Korean War 1950-1953 Armistice, $341 billion
4. Korean War 1950-1953 Armistice, $341 billion

3. Vietnam War 1965-1975, $738 billion
3. Vietnam War 1965-1975, $738 billion

2. War on Terror 2001-Present, $1.6 trillion
2. War on Terror 2001-Present, $1.6 trillion

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