Not that secretly. The major US players, press, finance, industry were all open NAZI supporters. They financed Hitler and the industry to start the war against communism. Eg they gave them free oil patents, took over IG Farben, the chemical industry to produce the needed oil for the tanks to invade Russia. They gave them huge credit lines to overcome the desastrous WW1 reparation payments. They financed the military buildup.
All played well for western fascists until Japan sided with Germany to take over China, South East Asia and esp. Singapore. When Singapore was threatened, US changed sides. The US certainly never thought Russia will win over Germany. That was their nightmare scenario. Workers rights, socialism. This would have killed their idea of freedom of private contracts over civil rights. Workers would demand 10 hours workdays. Or even less. Workers demanding their rights couldn't just be shot down, as in the Coal wars. Smaller companies threatening the big ones could not just be eliminated by the national guard and army, as in the Texas oil war, and the Railroad commission. The German NAZi system was the big goal of the US industry. A fancy "democracy", well liked all over the world, with a bright film industry, and a beloved charismatic leader.
Japan and Germany were barely allies; Japan signed a non-aggression pact with the USSR and the Germans were happy about it because they didn't want any competition for the spoils they thought they would have. This is one of the pivotal things that led to German defeat because it freed Siberian troops to reinforce Moscow and reverse the German advance in winter 41. Hitler compounded the situation by declaring war on the US after pearl harbor freeing Roosevelt to open supply and support the allies, I think this is one of his biggest mistake. I think you exaggerate the amount of support the Nazis had in the US but there was certainly a strong neutrality movement. If anything the Nazis admired America and manifest destiny and tried to emulate it with lebensraum.
>Hitler compounded the situation by declaring war on the US after pearl harbor freeing Roosevelt to open supply and support the allies,
Except that's not how that went down at all. The Lend-Lease[0] policy was in place long before Pearl Harbor or the German declaration. What's more, Roosevelt strongly supported the Allies even before that.
You are both right. After Germany declared war on the US, the US full transformed into a war economy. Something they wouldn't have done without that declaration. And Germany never switched to a full war economy, not that it would have changed a lot, so, if they did.
All played well for western fascists until Japan sided with Germany to take over China, South East Asia and esp. Singapore. When Singapore was threatened, US changed sides. The US certainly never thought Russia will win over Germany. That was their nightmare scenario. Workers rights, socialism. This would have killed their idea of freedom of private contracts over civil rights. Workers would demand 10 hours workdays. Or even less. Workers demanding their rights couldn't just be shot down, as in the Coal wars. Smaller companies threatening the big ones could not just be eliminated by the national guard and army, as in the Texas oil war, and the Railroad commission. The German NAZi system was the big goal of the US industry. A fancy "democracy", well liked all over the world, with a bright film industry, and a beloved charismatic leader.