The idea that observations of natural events would lead to theories which would explain these events is called

The correct answer is: Hypothesis.

Explanation:

Hypothesis is a tentative explanation of some guess formed out of the occurrence of natural event which can be tested by being observed for an estimated time and that can be lead to the origin of some theory.

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.