Ok, I'll bite. Give me an example of the US invading another country that did not start the war with us first.
I’ll give you a little leeway on “start the war” and include attacking us or not abiding by agreements, like OIF and OEF. I’ll also ignore our actions in Africa against elements like the Lord’s Resistance Army. They never attacked us, but I think it’s a pretty clear moral justification.
Admittedly I had to look up some of these because I don’t know everything. Note that a lot of these were not just unprovoked, but done to seize territory.
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The Seminole Wars in the 19th century: we decided to take ignored truces and just decided to attack and relocate them
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The Winnebago war: U.S. persons were trespassing on their lands and they stopped that, but we decided to respond with a show of force
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Mexican-American War/The Texas Revolution/U.S. annexation: Americans overthrew the rightful Mexican government in Texas and brought it into the U.S.
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The Apache Wars: U.S. captured their leader, kicking off hostilities
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The Comanche Wars: We just moved in and said it was our land…. Much like many smaller Indian wars.
Manifest destiny and all that
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The Cayuse War: Another manifest destiny war, but not a small one
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Navajo Wars: ANOTHER significant manifest destiny war
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Yakima War: U.S. persons disregarded agreements with the Yakima … because of gold
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The Pig War: We took the San Juan Islands from Britain after an American killed an Irish pig
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The Yavapi Wars: Hey, another war caused by manifest destiny. We take what we want
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The United States Expedition to Korea 1871: We decided to survey Korean waters with armed military vessels and strong arm a trade agreement. Korea told us they weren’t interested, but we continued to bring military ships and landing parties into their waters and land
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The Great Sioux War of 1876: We wanted their land because of gold
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The Egyptian Expedition 1882: We were protecting American ex-pats in Egypt, but still invaded Egypt without Egypt attacking the U.S.. It would be not too different than Russia invading Luhansk to protect Russian citizens living there who were being mistreated. Of course. We left Egypt shortly thereafter.
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Spanish-American War: our warship in Cuba blew up, possibly from its own poor operation, resulting in our invasion and declaration of war on Spain. But really, we were just looking for an excuse to exercise the Monroe Doctrine and take Carribean land from Europeans.
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Philippine - American War: Because our ship blew up in a Cuban harbor, we declared war on Spain and subsequently bought the Philippines from Spain… kind of? Pretty shaky ground to claim the Philippines as ours. And we couldn’t have them declaring independence after we spent so much money on their land.
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Boxer Rebellion turn of the 20th century: Powerful U.S. persons wanted to protect their lucrative opium imports into China under the guise of protecting U.S. missionaries
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The Banana Wars early 20th century: Cuba, Puerto Rico, Guam, and the Philippines taken from the Spanish weren’t enough, we wanted more of the Caribbean and Central America. Panama, Honduras, Nicaragua, Haiti, Dominican Republic. All should belong to us, right?
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Operation Blue Bat 1958 intervention in Lebanon: Yeah, the Lebanese government requested our assistance, but their resistance never attacked us before hand.
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The Vietnam War: South Vietnam welcomed our assistance, but make no mistake our national policy was that we wanted to be there to defeat the North Vietnamese communists, who never attacked us.
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Invasion of Grenada: Yeah, we were protecting American students, but it was a hell of a full scale joint forceable entry to seize an entire country to rescue the handful of American students. Oh, but we also wanted to stop communism. Admittedly this one is murky. I don’t think it is totally unjustified. But it was massively disproportionate to the risk of Americans in their country. The U.S. just wanted to stick it to communism.
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Invasion of Panama: Yes, we had a CIA officer imprisoned there, and a military couple were killed at a checkpoint. But Panama had not declared war on us. There were other levers of national power that could have been applied. But nope, full scale joint forceable entry and regime change time. Admittedly this one is murky. I don’t think it is totally unjustified. But it was massively disproportionate to the risk of Americans in their country. The U.S. just wanted to ensure control of the canal.
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Invasion of Libya 2011: A U.S./Hillary Clinton instigated NATO operation that constantly escalated what was claimed to be the limits of what they’d do. Lies upon lies of what the goal and extent of operations would be. Gaddafi had been fully cooperating with the U.S., but Hillary wanted him dead and didn’t mind destroying an entire country to do so.