What I find interesting about the history of superhero movies, is how they were indeed either US-leaning or kind of even between US and overseas at the box office. Looking at the 2000s, Spider-Man 3 really broke out with 62% of its global total coming from OS.
Pre-Avengers, Thor and First Class get to almost 60% overseas share, but for the former it means matching IM1 and for the later staying consistent with the other movies in the franchise despite facing a drop domestically.
Then Avengers happen. The Dark Knight rises happens. Boom. Instantly the audience grows. Iron Man 3, The Wolverine and Thor TDW all have 68%(!) share overseas. Man of Steel has 56%. For the rest of the MCU flicks up until FFH, it becomes the norm for 2/3 of the box office to come outisde the US, unless you're Guardians or Black Panther. For FoX-Men, same sans Deadpool. DC flactuates, but unless you're Wonder Woman, you're leaning os and outside of that and Suicide Squad their films hit 60-70% share through Joker. Sony's live actions efforts in the remaining 2010s hit 70%, their animation leans domestic.
Post-pandemic and not including day-and-date releases, the only cbms to have more than 60% of their box office come from overseas? The Flash at just 60% and then Aquaman 2, Joker 2 and Venom 3 all with over 70%!