Afghanistan is a Vietnam like nightmare for both the UK and Russia. The land has little value and offers many, many places for rebels to hide. But both Russian and UK strategic aims require Afghanistan to be in their sphere of influence.
Yep. however the Vietnam-like scenario only begins when ONE conqueror begins to try and solidify its hold on the country. As long as it is a battlefield between two invaders the natives will mostly play off one against the other and therefore be not much of a problem.
I'm leaving the Canada issue aside for a momnet.
Outbreak of War, Timeline.
WW1 Triggers:
Opium: The British Governor of Afghanistan, deducing that Opium could fetch a good price in unfriendly portions of Europe, begins to send shipments of the drugs to France and Russia, which leads to international tensions. France and Russia will not go to war over the drug trade, but the antagonism is prolonged.
Serbia and Bulgaria clash: Serbia and Bulgaria both claim the same region of what is today Macedonia.
French/German rivalry: France wants AL, and Germany wants it too.
[Thoughts: I'm going to insist that the USA doesn't have Canada. If the USA grabbed Canada, this means that you have a UK that is going to have claims on it, leading to another bitter spat that draws the USA into the conflict.]
April 14, 1914: Bulgaria, with support from Hungary, decides to grab Macedonia from Serbia. On this day, Serbia is presented with demands for the immediate cessation of this region. It declines.
April 21, 1914: Bulgaria mobilizes against the Serbian Border. Serbia mobilizes as well, and, unexpectedly, so does Romania.
April 23, 1914: In a quiet meeting in Berlin, Kaiser Wilhelm summons the leading members of German nobility--the Princes and Kings of Smaller German States, including King Ferdinand of Austria and Hungary. As much a matter of formality as well as an issue of state, the important portion of the gathering, just two hours out of the six hour meeting, discusses the German and Hungarian position on the Bulgarian-Serbian crisis. Although some reiterate variations of Bismarck's predictions that some Balkan Incident would trigger a global war, the ruling elites are pleasantly reminded that should the situation come to that, the German-Hungarian Armies are fully capable of crushing France in the same great way as it happened in 1870. With their support in hand, Germany's position is finalized--Germany will support Bulgaria, and the Entente would either read the writing on the wall and let it happen, or they will lose a quick war, just as 1870 had been before.
April 25, 1914: Serbia formally requests Russian Assistance. A firefight breaks out on the Serbian-Bulgarian border, later revealed to be caused by Serbia.
April 26, 1914: Russia begins to mobilize. Germany protests; the German Army begins to counter mobilize.
April 27, 1914: Unexpectedly, France begins to mobilize. The French Idea is that they can finish their mobilization first, and press the advantage to grab and hold AL from Germany.
May 1, 1914: Bulgaria receives support for Germany for a Plebiscite of Macedonian Territory. Serbia responds by launching a surprise attack against Bulgaria, apparently with Russian Support.
May 9th, 1914: With Russia still mobilizing, France attacks a fully mobilized Germany. The attack achieves local surprise, and France seizes Metz and Strasbourg.
May 10th, 1914: Italy denounces France's surprise attack, begins to mobilize. France is forced to begin diverting reinforcements to protect its southern flank.
May 11th, 1914: Russia and Germany do not declare war, but admit that a state of war exists between them.
MAY-JUNE 1914: The French consolidate their hold on AL; resisting a hastily assembled German counterattack. France responds by building trenches to cover the area.
In the Eastern Front, the German Army is Forced to Withdraw from Konigsburg and is in full retreat against a Russian enemy who outnumbers them 2:1 on some parts of the Front.
JULY 1914: The Miracle of Tannenburg. A Haphazard Russian Advance and rivalry between the Russian commanders means that the Russian advance is fragmented and vulnerable. Paul Von Hindenburg achieves one of the greatest victories in the war by smashing the Russian armies, despite their numerical superiority. Another Front opens as Italy begins to attack and faces counter attack along the French Border. This fighting has already begun to spread to colonial engagements. Tunisia is hotly contested by Italy and France.
August-November 1914: The French positions in AL are gradually pushed back. Despite their best efforts, France is unable to hold their gains. In the south, Italy is stalemated, advancing no more than 5 miles into French territory. And during this time, Russian forces are slowly being beaten backward by Germany. To resolve this situation, Russia begins to redeploy her forces against Hungary.
December 14th, 1914: The UK decides to formalize its control over Afghanistan; a move they know to be provocative, but Russia is in no position to refuse. Unfortunately, as UK Forces begin moving into Afghanistan en masse, Russia begins to do the same.
December 20th, 1914: A US merchantman is sunk by a German submarine, chilling relations between Germany and the United States. Woodrow Wilson is too busy planning endless incursions in Latin America to seriously notice.
Almost entirely rather well done. Opium is not the trigger I would have used, instead skirmishes over Fashoda and/or Afghanistan or UK claiming Siam or France intervening in the Russo-Japanese war, but it is fine enough.
It is realistic that Italy would eventually get stalemated in the Alps, but it is a little excessive to so after just 5 miles. Using the 1940 outcome is not correct. In comparison to the French Army, the Italian Army was in much better shape in 1914 than in 1940, and the Alpes fortifications were not as strong. I expect them to advance at least 20-30 Kms before getting stalemated.
An USA merchant ship getting sunk by a German submarine is a rather odd occurrence, since the UK is neutral (but getting close to the Central Powers by the hour), Germany is not that much involved in submarine warfare in 1914, and commerce between USA and France was not that abundant. It is correct to show that the USA are disinterested in the war in Europe, but I think it's preferable to just let Wilson issue a declaration of strict neutrality as he focuses on his Latin America "police actions".
Serbia should have been overrun almost immediately. With the Hungarians hammering them from above, and the Bulgarians from the side, they are hopeless. OTL, they collapsed as soon as Bulgaria entered the war. Following your TL, we could have them fall in early 1915, but still I think it is unrealistic for them to resist six months. Also Italy is an enemy here, and most probably will send some troops to attack Serbia from Montenegro and Albania as well, so they are attacked from three sides, and they ought to fall within a couple months. Also, the defeated Serbian Army has nowhere to retreat to, so it will be completely captured or destroyed.
Therefore, I'd revise your 1914 TL as follows:
April 14, 1914: Bulgaria, with support from Hungary, decides to grab Macedonia from Serbia. On this day, Serbia is presented with demands for the immediate cessation of this region. It declines.
April 21, 1914: Bulgaria mobilizes against the Serbian Border. Serbia mobilizes as well, and, unexpectedly, so does Romania.
April 23, 1914: In a quiet meeting in Berlin, Kaiser Wilhelm summons the leading members of German nobility--the Princes and Kings of Smaller German States, including King Ferdinand of Austria and Hungary. As much a matter of formality as well as an issue of state, the important portion of the gathering, just two hours out of the six hour meeting, discusses the German and Hungarian position on the Bulgarian-Serbian crisis. Although some reiterate variations of Bismarck's predictions that some Balkan Incident would trigger a global war, the ruling elites are pleasantly reminded that should the situation come to that, the German-Hungarian Armies are fully capable of crushing France in the same great way as it happened in 1870. With their support in hand, Germany's position is finalized--Germany will support Bulgaria, and the Entente would either read the writing on the wall and let it happen, or they will lose a quick war, just as 1870 had been before.
April 25, 1914: Serbia formally requests Russian Assistance. A firefight breaks out on the Serbian-Bulgarian border, later revealed to be caused by Serbia.
April 26, 1914: Russia begins to mobilize. Germany protests; the German Army begins to counter mobilize.
April 27, 1914: Unexpectedly, France begins to mobilize. The French Idea is that they can finish their mobilization first, and press the advantage to grab and hold AL from Germany.
May 1, 1914: Bulgaria receives support for Germany for a Plebiscite of Macedonian Territory. Serbia responds by launching a surprise attack against Bulgaria, apparently with Russian Support.
May 9th, 1914: With Russia still mobilizing, France attacks a fully mobilized Germany. The attack achieves local surprise, and France seizes Metz and Strasbourg.
May 10th, 1914: Italy denounces France's surprise attack, begins to mobilize. France is forced to begin diverting reinforcements to protect its southern flank.
May 11th, 1914: Russia and Germany do not declare war, but admit that a state of war exists between them.
MAY-JUNE 1914: The French consolidate their hold on AL; resisting a hastily assembled German counterattack. France responds by building trenches to cover the area.
In the Eastern Front, the German Army is Forced to Withdraw from Konigsburg and is in full retreat against a Russian enemy who outnumbers them 2:1 on some parts of the Front.
The USA declare their strict neutrality in the war. Woodrow Wilson is too busy planning endless incursions in Latin America to seriously pay attention to European matters.
JULY 1914: The Miracle of Tannenburg. A Haphazard Russian Advance and rivalry between the Russian commanders means that the Russian advance is fragmented and vulnerable. Paul Von Hindenburg achieves one of the greatest victories in the war by smashing the Russian armies, despite their numerical superiority. Another Front opens as Italy begins to attack and faces counter attack along the French Border. This fighting has already begun to spread to colonial engagements. Tunisia is hotly contested by Italy and France and Equatorial Africa by Germany and France.
Attacked from three sides (Hungary from the North, Bulgaria from the East, and Italy from the West, the latter sending an expedition corps across Montenegro and Albania), Serbia quickly collapses after two months of war, and it is occupied by the Allied powers, its entire army captured or destroyed.
August-November 1914: The French positions in AL are gradually pushed back. Despite their best efforts, France is unable to hold their gains. In the south, Italy is stalemated, advancing no more than 20 miles into French territory. And during this time, Russian forces are slowly being beaten backward by Germany. To resolve this situation, Russia begins to redeploy her forces against Hungary.
December 14th, 1914: The UK decides to formalize its control over Afghanistan; a move they know to be provocative, but Russia is in no position to refuse. Unfortunately, as UK Forces begin moving into Afghanistan en masse, Russia begins to do the same.
I also suppose the big events for 1915 should be the intervention of Romania and Britain. I propose the following rough timeline: enticed by Franco-Russian promises about Transylvania, they enter the war in early-mid 1915, but after initial advances, they are overrun by a combined Hungarian-Bulgarian counterattack and Wallachia is occupied in 3-4 months. This mirrors the OTL Romanian campaign and just like Serbia, I assume the outcome would repeat here, since Serbia is already out of the picture.
About the Western front, in Spring 1915, France tries to turn the strategic balance by unleashing their "great idea": in combination with the Romanian entry in the war, they plan to go through Belgium and encircle Germany in Alsace-Lorraine. There two options here: either Belgium resists and pleads for British and German help, or they are lured with promises of territorial gains in Rhineland and they let them cross. Anyway, the British already getting steadily more suspicious and angrier over Russian moves in Afghanistan, are outraged over the violation of Belgian neutrality and declare war on France and Russia. The French are able to penetrate Belgium in depth (how much depends whether the Belgians let them through or they resist) but they are eventually stopped by the Germans rushing troops north and the British deploying the BEF in Flemish ports. The front eventually stabilizes somewhere in Belgium. It is also quite possible (but not a given) that the Netherlands may open its territory (if not actually enter the war) to the Anglo-German, which woulf significantly facilitate the deployment of the British forces.
For the moment, the front stabilizes in the Flanders and Waloonia, even if the French are overstretched in the long term. The British fleet teams with the German and Italian ones and bottles the Franco-Russian ones in their ports. France and Russia come under a total naval blockade. Altough this does not put their population into immediate risk of starvation (especially Russia) their war industries suffer significantly. In Africa and Asia, French troops in the colonies, utterlu deprived of supplies, are gradually wiped out. In Central Asia, Russian and British troops clash in Afghanistan and Persia. And Japan begins to consider an intervention against Russia.
If you agree with these ideas, do you wish the honor of the detailed TL for 1915 ? You did 1914 nifty. On the big picture, I assume that by the end of 1915 or early 1916 France should crush under pressure, even with trench warfare favouring defense, they are way overstretched, fighting three great powers on three sides, especially if the Anglo-Germans and the Italians establish some kind of Allied High Command and start coordinating and combining their offensives.