Emperor Constantine said:
Russia either gives support to the murder of Royals or backs down: the Tsar chooses the later. So no Great war.
Regrettably, you need to change Austria's view, not Russia's: the Serbs gave the Austrians about everything they'd demanded, & Austria still DoW.
Emperor Constantine said:
What would the long-term affects of avoiding this pointless conflict be? Would nations like the Austrian, German, Russian and Ottoman Empires still exist? Would communism, socialism and fascism ever rise to power? What about the colonial empires? With no massive war would they remain relatively intact? Would the US ever rise to become the dominant world power? Would India remain part of the British Empire? Basically what does this site think the world today would look like without the world wars.
Off the top of my head, I'd say no Armenian genoicde, no Holocaust, no nuking of Hiroshima & Nagasaki, no Korean or Vietnam Wars, & no Sov occupation of EEur, plus the U.S. would be segregated much longer (no black vets, no Holocaust), & anti-Semitism & racism would be much more acceptable (same reasons).
Worse still, you'd probably have many more countries with the Bomb, possibly even a major nuclear exchange in the late '40s-early '60s period (depending on exactly when the Bomb was first completed & by who; my guess is, the Brits get there first, but TTL, it might be Germany)
Would the U.S. still be the dominant power? Yes: the economic eclipse of Britain was already in progress by 1914 & wouldn't stop. The difference might be less, without Britain suffering the damage of war & the privation of Lend-Lease (& Winston's giveaway of Britain's tech), but... You'd also have (mainland) ROC & Germany as major competitors, with IMO Russia a "second-tier" player, along with Japan & maybe Korea & Vietnam.
Burma's likely to be a member of OPEC.
India was leaving anyhow, so no change there. France probably still controls IndoChina & Algeria & elsewhere.
There's probably a lot less war in Africa, & a fair bit less tension & terrorism in the Mid-East (no U.S.-SU conflict-by-proxy).
Fair chance there was no Space Race.
You've also butterflied away a whole genre of films (the "crazed Vietnam vet"), along with "Magnum, P.I." (as OTL, anyhow; something like it, using the old "5-0" sets & studios, probably still does get made). You've also butterflied away
Bolan (tho, again, probably he's replaced by somebody else, like, say, Joe Copp
). It also butterflies away "Tour of Duty" (which I liked
).
Salamander said:
aerial observation (balloons) and machine guns
You're vastly overstating the impact of MG.
The real killers were HE shells, the fast-firing howitzers (thanks to hydraulic recoil mechanisms), typified by the French M1897s, & field telephones (able to put indirect fire on target).
It's also been argued the airplane, by making secret movement of armies impossible, made the trench stalemate inevitable.
Not least because there was no way to add enough armor & move fast enough to overcome the threat of arty & MG until IC engines were coupled with armor & tracks...
Julius Caesar said:
Without WWI, the American economy doesn't enter the upswing, while most economies of Europe entered a downswing. Without this upswing, the Great Depression may or may not take place either.
Possible, but it's not just an "upswing": it's driven by war demand, which helps boost overproduction. Now, there may well be an economic bubble anyhow, & so a Crash, because the Fed was busy screwing around & not thinking straight ("permanent prosperity"
).
There's one thing almost certain not to happen, tho. Without the demand for more agricultural production, the marginal land that got put in production OTL isn't, so... (Does that butterfly the Dust Bowl entirely? IDK: there were so many idiots trying to farm the Oklahoma Panhandle...
)