Military strength under FDR was maintained so weak that Japan and Germany thought it was a their best move to declare war on America.
No, they didn't. They gambled and lost. Germany declared war after Pearl Harbor and Japan knew when they realized the carriers were not at Pearl they would probably be fighting only for a satisfactory truce.
They declared war on us because they felt they could. Grow up and smell the roses.
They declared war because FDR refused to allow them to bully or dictate to the USA. In the case of Germany. he would not allow them to tell us who we could trade with or change our freedom to operate on the high seas. Pearl Harbor overshadows the fact that Germany was not only harassing US flagged ships, but attacking US Navy ships and actually killing US Sailors in those attacks. Japan, with a treaty with Germany, knew that situation was leading to a war that would place it in a war with America. In addition, of course, was the anger Japan felt about being cut off from it's necessary oil supply. FDR let it be known that the US would not be pressured or bullied into contributing to the war atrocities such as the Rape of Nanking.
Countries only attack other countries when they believe the other to be weaker.
Every war in history has followed that scenario.
And both Japan and Germany knew America was much weaker than they were.
Thanks to FDR keeping our Army at 19th place in the world, right behind Portugal.
Another distortion. Your numbers do not reflect actual strength, only numbers of men in the Army and not including those in the reserves or Guard. Nor does it include the Navy. Not sure how many aircraft carriers the Portugal Navy had, or for that matter how many modern advanced aircraft ready to be produced.
Treaty obligations and politics restricted the US, but, the US was not restricted in developing modern warplanes, ships, and particularly aircraft carriers. As soon as the politics allowed, the numbers of men and women in the military tripled. Fortunately, they were already partially trained. To cheat on the numbers, FDR had drained the ranks of officers and employed them as commanders of CCC and other relief groups, giving them invaluable training and experience, and when that happened the Army Reserve refilled their officer ranks as the officers transferred went onto CCC payrolls. At the same time, millions of young men were given military-style training of following orders/ teamwork and living strict and disciplined lives of barracks and tent living. It is part of what made the quick growth of the military so successful.