That was never the case. American power has always been in the exercise, not the restraint. Starting with the ruthless pogroms of natives, to build a continent-spanning empire.
Our expansion west, and our use of military force was ad hoc from 1787 through Wounded Knee in 1890. We didn't get organized until after the Civil War. It was always ugly, even the raids Andrew Jackson led against the Creek are up there with worst of the worst, but we evolved our tactics and policies to go even darker in the 1870s. But it needs to be pointed out that we often fought along side indigenous tribes who'd been at war with many of those other tribes, which speaks to a deeper truth about North and Central America - this has always been a place of war. It's literally in our blood. As someone pointed out, we just took the British playbook, and added new chapters to use local tribes against each other to meet our goals.
This was all done with an army that numbered around 30,000, and local tribes of about the same strength. But we were not a super power in the 19th century, but by the 1830s we were starting to have super power problems. The French had washed their hands of this continent, but the British were still to the north, and Mexico was flexing to the south, and Russians were out here on the west coast. We had already jumped into the Barbary War, and after the War 1812 we got salty. We went to war with Mexico, went all the way to Mexico City forcing their surrender. But we didn't keep Mexico, we signed the
Treaty of Guadalupe Hidalgo, and went home keeping California, and their territories north of the Rio Grande (which we paid $15 million, and we really didn't need to do that).
I do have to ask, why do the Spanish, British, French, Mexico, Sioux, Cheyenne, Kiowa, Apache, and Comanches get a pass whenever American expansion is discussed? We didn't invent the game, we just played it.
The US tested more weapons than the rest of the world combined. There's a period of a couple years where the explosions just don't stop.
And?
Have we used these weapons in any of our wars since August, 1945? Why is that, do you think?
And back then is was only the US, Soviet Union, Great Briton, France, and eventually China, and most countries don't want these things. Sure, we tested the crap out of our nuclear devices, why wouldn't we? It was, and is the responsible thing to do because the military understood, even back then, that at some point the American people would elect morons into power, and they needed to provide accurate data about the effects, and long term outcome of using nuclear weapons. The smartest minds in the word worked on our nuclear weapons knowing they might end up in the hands of a guy like Trump, and he hasn't seriously threatened anyone with nukes (yet). We also tested them to understand what we could face if and when they fell on our country. Scary weapons require scary things be done to ensure nothing scary happens, and that's the paradox of being a nuclear power.
We could have nuked Hanoi, Nixon openly proposed this a few times in NSC meetings. After 9-11, we could have brought one of our Ohio Class subs to launch depth, and erased Afghanistan. We didn't.
It wasn't blue jeans and hamburgers that defeated the Soviet Union, it was the inability of their economy to keep up with the American war machine.
We never had a war machine.
Our defense posture was based as a response to Soviet and Chinese aggression. We would have been happy to not be the world's policeman.
After WWII, Eisenhower's foreign policy after Korea was to threaten hostile nations nations with nuclear force. When JFK came in he expanded our conventional forces to give the US what was called a flexible response. So instead of threatening a nuke strike, we could send an aircraft carrier, Marines, and the Army. Obviously flexible response sometimes gave us a military option we should have skipped.
Sure, Russians may have coveted Western fashions, but a generation after the fall of the Soviet Union, it's obvious that Russians never adopted Western values.
That's because Russians have always been their worst enemy. We never needed nukes to destroy Russia, just patients while they destroy themselves.
There has never been a time in history where American power - or any nation's power - manifested in the restraint, not the exercise of that power. Whether military, or economic. "Restraint" is the sour-grapes narratives of other powers, who hope to shame America into backing off and giving them room to exercise more power of their own.
You need to make up your mind. You began your post by dredging up our Indian Wars where we just killed as many as we could, and now you postulate that not killing as many people as we can is weakness. We learned from our 19th century atrocities, and they loom over much of our military decision making today. The Soviets would just level Afghan villages, through tribal leaders under tank treads, kill live stock, and poison wells. While we killed some non-combatants in Afghanistan it was never intentional, and there were plenty of targets we were forced to pass on because of proximity to civilians. Russia doesn't make this effort, nor does China.
The
Anbar Awakening in 1987 turned things around for us in Iraq because of our restraint. Since the end of the Vietnam War US Special Forces ODA teams have inoculated more kids and cattle, dug drainage ditches, built schools, and stood up city councils all over the world. Sure, they've been shooting bad guys in the GWOT, but their overall record shows they helped far more people than they've killed.
That is restraint, and it should be something we're proud of, and we used to be.
American restraint is what allowed Maduro to take over Venezuela.
Our bad.
American restraint is what keeps Ukraine hanging by a thread, rather than climbing a ladder to decisive victory.
Honestly, if we knew just how much the Russians suck at war we would have been more hands on. But I guess I need to point out that the Russians have those pesky nuclear weapons you complained about, and they tend to make strategy a little prickly. I'd love to joke about how their missiles might not work as advertised in a dependable manner, and even the Russians aren't completely certain all of their warheads will detonate (one of their missiles failed in a test this past December, lol), but they have a lot of missiles, and it's always been about quantity over quality with them.
I have to ask you, which American cities are you willing to trade for Ukraine?
Or maybe we can cool our jets and make nice when we can, instead of taking other countries' lunch money, and stuffing them in a locker.