What does the woman who is looking through the window refer to ?

we can't help you if we don't know the full passage or comprehension

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

its many islands, high mountains, and remote peninsulas isolated population centers.