Given that the Central Powers historically came close to actually winning the war, I find that unlikely. Sweden's participation could've resulted in any of the following scenarios:
- Russia knocked out of the war in 1915, due to having 30 fewer divisions to face the Gorlice-Tarnow Offensive
- Italy and Romania never join the war, or even join the Central Powers; this would have strongly shored up Austria-Hungary's position and weakened Russia's
- A general German offensive on the Western Front in 1916 instead of the more limited Verdun Offensive (which none the less contributed to the later mutiny of the French Army)
- No Brusilov Offensive in 1916, again keeping Austria-Hungary stronger
- Possible diversion of British troops from the Middle East to the Western Front, allowing Ottoman Forces to tie down more Russian forces
- Italy (assuming it even entered) knocked out of the war in 1917 by a much stronger Caporetto Offensive
- Operation Michael taking place with more reserves, allowing it to overwhelm the allies
At any rate, Swedish participation would've definitely resulted in the following factors:
- A weakening of Russia's lines and strategic position
- A strengthening of Austria-Hungary's lines and strategic position
- Freeing up substantial German manpower
The United States did not enter the war until 1917 and didn't have a meaningful number of forces on the Western Front until the spring of 1918. Sweden's participation would've seriously extended Russia's lines and freed up at least three times the German manpower that was used at the opening stages of Verdun.
I'm not sure what Mexico, which was in a state of civil war, would've earned the Central Powers (beyond guaranteed war with the United States), and Ireland wasn't even a country.
Everything you believe is wrong. Yes,
you!Boom. You just got Dave'd. -Bramlow