Why Britain was unlikely to stay out of 1914

What would have to change for Britain not to enter the First World War?

Germany would have needed to reduce its challenge much earlier and avoid actions such as invading Belgium, because British strategy resisted a dominant continental power controlling the Channel-facing coasts.

For Britain to remain outside the war, Germany would have needed to reduce its naval challenge well before 1914 and avoid invading Belgium. British strategy traditionally sought a divided Europe rather than a dominant continental power. Control of the French, Belgian, Dutch, and Danish coasts had direct maritime importance because it could concentrate hostile power opposite Britain and its sea routes. Germany's rise therefore shifted British alignment away from France as the old principal concern and made non-intervention increasingly unlikely. The counterfactual depends on Berlin changing course before the crisis rather than London simply choosing neutrality after it began.