The rise of dictatorship caused other nations to feel threatened and become defensive. The fear of being taken over by the totalitarian, power seeking dictators was real and drove armies to grow and the public to support strengthening borders.
The philosophical term “a priory” was popularized by
Immanuel Kant and it concerns epistemology, philosophy dealing with the theory
of knowledge. A priory actually refers to something that can be deduced by
reason alone, while the "a posteriori" is something that cannot be known by reason
alone like empirical facts.