During the Cold War, Scion destroyed a nuclear test missile and the facility that launched it. This wasn't widely known, but it led the US to de-emphasize nuclear weapons under the (correct) belief that he would stop any nuclear conflict, effectively ending the Cold War. Although the details weren't publcized, it was generally known that the threat of Scion was what led nuclear powers to stand down.
Dragon was forbidden from using viruses to infect the computers of Americans that didn’t have a warrant out for their arrests. She later found a way around this, making use of computers she allowed an Indonesian cartel to infect.
The United States briefly adopted a policy of tattooing Simurgh victims with a white bird on one hand or on one arm so others would know to take care. The policy lasted for four years, covering two of her visits to the US. It caused prejudice and violence against those affected, and many others got similar tattoos in protest.
When a portal to Earth Aleph was created in the US by Professor Haywire, treaties were made to prevent them finding a way to invade the alternate Earth with the help of parahumans and acquiring their resources, becoming the world's greatest superpower. All attempts to transmit people or objects between the worlds were banned.
The United States has become a major resettlement area for refugees of failed states and areas devastated by Endbringers and the like. With the Preservation act, legislation signed during the Bradley administration, helping such people to get on their feet. This allows Capes such as Miss Militia to obtain citizenship with ease.
People across the United States watched the aftermath of Leviathan's Attack on Brockton Bay, wondering if it would become another area that simply couldn't recover. The United States Senate debated condemning the city.
↑That's essentially it. Scion was stopping raiding groups and paramilitary groups in Africa and the Middle East, and then began to respond to weapon testing in much the same way. Scion shot down one test missile from a country away and then hit the launch facility. This wasn't widely publicized, but it did have ripple effects in terms of culture and America's military spending/focus.
Part of Scion's motivation in doing so was to prevent a scenario where the shards couldn't find hosts (for much the same reason, he would have gone out of his way to stop, say, String Theory). Part was Norton's instructions. But the countries basically realized that it wouldn't work. - Comment by Wildbow (archived on Spacebattles)
↑Fantastic question, and one I’m not sure I can give a fantastic answer to.
Why is that? Well, primarily, there’s the issue of trying to quantify ‘damage’. As stated in Legend’s pre-battle speech (early in arc 8) there’s almost always grievous losses but they aren’t always the same sort of losses.
You have the events that left the world reeling: Lausanne, Hawaii, Kyushu, Newfoundland, Moscow, Sydney. The attacks that left major areas uninhabitable or unrecoverable, with wide-reaching effects on the rest of the country/region/world. In this setting, for example, Japan isn’t a world power and it’s still dependent on international assistance 12 years after Leviathan’s visit to Kyushu.
But even there, where do you say, “Ok, that’s the sum total of the damage done”? The disaster at Kyushu, the number of refugees seeking living space/work and the pressures on the rest of Asia’s pacific border might have led to some more unrest and tension. Some friction, some ‘small’ wars, infighting and intermingling. Refugees and immigrants. Many settle in major cities across America because President Bradley’s Preservation Act gives them a hand in getting on their feet.
Do you factor that last point into the damage as well? Lung comes to Brockton Bay in part because of the booming population of Asian immigrants (which hasn’t yet set down roots). Bakuda was born to a Westerner mother and Immigrant father. Do you count the damage they’ve done? Ditto for Mannequin and the Simurgh.
But that’s only the major hits, the broad strokes of the brush and all the repercussions/spatter that follows from that. Attacks end in other ways, for example. Legend mentions mass loss of life. There’s economic damage that follows from that, disease and explosions in the population of vermin when a quarter million people die in a concentrated area.
There’s the deaths of countless heroes, and how that biases things further towards the general villain population. If the selfless throw their lives away for the greater good and it’s primarily the selfish (or the very powerful) who are left, how does that skew things?
And I should stress that weak points aren’t necessarily just areas which are geographically vulnerable. There’s places where there’s ongoing conflict (like we might point to the middle east over the past decade), places where it takes little effort on the part of the Endbringer to deal maximum devastation (ie. a nuclear power plant, military bases) and spots where a great many resources are invested (be they great minds collected in one place or major projects like Dr. Gramme’s major projects in trying to save the world). Did anyone else catch the mention of the water crisis? Leviathan isn’t always attacking cities, and the world has only so much accessible freshwater.
To answer your question in the general sense? Relatively few places have been hit as hard as the major examples listed above. But figure this has been going on for 20ish years. Behemoth shows up in the early 90’s, attacking once a year, roughly (twice in 1994), Leviathan shows up in the mid 90’s (now we’re up to 2-3 Endbringer attacks a year), and Simurgh comes in just after the turn of the century (now 3-4).
I mentioned in a comment during the Endbringer arc, but I said something like ‘Behemoth is the cape-killer and Leviathan levels cities’. Figure each Endbringer has attacked 16 to 20 times so far, account for the bias towards killing capes (Behemoth) vs. wiping out landscapes (Leviathan) and that Brockton Bay is pretty middle-of-the-road for the kind of aftermath you see, and maybe you can make an estimate.
Ballparking it? 8 or 9 Endbringer attacks in America over 20 years. - Comment by WildBow on Colony 15.5