1. WWI-Unrestricted sub warfare turned people against Germany. 2. WWII-America liked Germany prior to WWII, Germans even visited the US in the 1930s. Germany declared on America. America did NOT declare war on Germany (America simply reciprocated). Hitler wanted Japan to open a second Russian Front, as he had just invaded Russia the same year that Japan bombed Pearl Harbor; he also declared war the same year he invaded Russia. If Hitler helped Japan, he hoped Japan would help him.
American public opinion turned against Germany in WW One & WW Two for various reasons. In WW1, Germany invaded France & Belgium in August 1914. Because, Belgium was a neutral country, Americans were upset with Germany. The invasion of Belgium however was not the most important factor. Later, German unrestricted submarine warfare also turned American public opinion against Germany. Then as a final straw, the German's Zimmermann telegram message to Mexico further angered Americans. In WW2, Germany invaded Poland, neutral Denmark, neutral Norway, neutral Holland, neutral Belgium, and so forth on & on. German submarine warfare also turned public opinion against Germany.
Belgium was a neutral nation
German was a monarchy which didn’t appeal to many Americans democratic ideals (apex)
Most likely the attacks by Germany (in either world war) against American civilians and American shipping in the Atlantic Ocean.
Before WW I, American public opinion turned against Germany following persistent attacks by submarines on merchant shipping. The most notorious sinking was that of the passenger steamer RMS Lusitania on 7 May 1915 when 1198 out of 1959 passengers and crew were killed. The RMS Lusitania was a British ocean liner, and was was torpedoed and sunk by a German U-boat. In the case of WW II, the surprise attack of Pearl Harbor turned us against Japan which prompted her ally Germany to declare war on us.
No, the sinking of the USS Maine caused the Spainish-American War.
One significant event that contributed to America's entry into World War I was the sinking of the RMS Lusitania in May 1915 by a German U-boat, which resulted in the deaths of 128 American passengers. Additionally, the interception of the Zimmermann Telegram in early 1917, in which Germany proposed a military alliance with Mexico against the United States, further inflamed American public opinion against Germany. These incidents, combined with ongoing unrestricted submarine warfare, ultimately led to the U.S. declaring war on Germany in April 1917.
Because the U-boat campaign killed Americans and destroyed U.S. property it turned public opinion against Germany.
the Halocaust and Hitler's determination to kill all Jews and establish a super race
Russia's actions during World War I, particularly its withdrawal from the war after the Bolshevik Revolution in 1917, created a power vacuum on the Eastern Front, allowing Germany to shift its focus westward. This increased German aggression against Allied forces, which heightened tensions. Additionally, reports of German submarine warfare, including attacks on American ships, further galvanized American public opinion against Germany. These factors contributed to a growing sentiment in the U.S. favoring intervention, ultimately leading to America's declaration of war in April 1917.
This is a matter of personal opinion, but I believe we are not responsible. I believe that if we are to help solve the problems of others, we must first solve our own.