Why was the US an ally of GB/France/etc and not Germany/Italy? Contrary to your belief, greed can be ideological -- striving for global free trade is an example of this.
That's a big difference, and one you chose not to respect.
His CiC may not have agreed, but my grandfather told me, to my face, that he fought fascism and was proud to do so.
EDIT: To make clear what I meant, re: your comment: the state-building narrative the US has adopted substitutes the righteous struggle of people like your grandfather in order to avoid acknowledging, among many things, the reluctance to participate in world affairs and the frankly brazen pro-Nazi stances of many in the american public and the government at the time.
Well, certainly, the Roosevelt Administration was, but they were (prior to Pearl Harbor) also forced to maintain an outward pretense of neutrality while backing the Allies, because a large part of the rest of the US was also motivated by ideology...to either be sympathetic to the Axis Powers (one large, well-bankrolled faction) or to be opposed to intervention (another large, well-bankrolled faction, that often worked together with the preceding one against any interventionist policy.)
Businesses in the US were serving both sides of the conflict.
1. https://en.wikipedia.org/wiki/IBM_and_the_Holocaust#cite_ref...
However, by 1940, it was very clear that the US was going to get dragged in anyways, and it would serve the US interests first to start preparing for war before it starts (note that the draft was instituted over a year before Pearl Harbor). Moreover, the US was neutral only in name: various acts passed more or less saying that the US would give aid to anybody so long as they were British or French. (Originally, it was cash-and-carry, but when Britain exhausted its cash reserves, it became Lend-Lease instead).
Also, the US formally joined the war in 1941, but were providing material support to the Allies and otherwise prepping before then.
The intelligence services knew. The general public didn't.
The US provided support to the side they ideologically agreed with -- it wasn't just a case of "Germany randomly declares war on the US".