This fanfic had rewritten and edited on December 7th, 2021. To remember the 80th anniversary of the Surprise Attack on Pearl Harbor and 80 years since the United States entered World War Two (on the 8th).
Also I do not own Hetalia: Axis Powers!

Alfred stormed in a meeting of the Axis in the Empire of Japan; he gave off a furious demeanor. It gave Germany a shudder, recalling the US's intervention in World War 1. However, at the first look at Alfred's appearance, he knew something was very wrong. It looked different than usual. His appearance seemed like Alfred was on a battlefield, and his glasses were crooked, and one of the lenses was fractured. His brown bomber jacket was torn and battered. However, his eyes hinted at pure hatred and thirst for revenge. His eyes color was crimson, not blue.

'Oh no,' Germany thought, horrified he recognized that eyes. He remembered those eyes very clearly back in World War I.

He is not Alfred anymore. He is America.

"How dare you, Empire of Japan!" Alfred—no—America bellowed.

Empire of Japan looked away, avoided eye contact. "I have to, America-san," Japan spoke with no remorse for what he had done.

Germany looked at the Empire of Japan; he swallowed, "Japan…What did you do?"

Empire of Japan hesitated and then answered Germany's question, "I bombed Hawaii."

Germany's eyes widened in shock. No! "Idiotin! You realized what you have done?!"

Alfred—no—America's icy glare at them with a heartless grin blooming on his face, "you made a huge mistake, Empire of Japan, and your allies are going to fall in my hands." He choked with hysterical laughter.

"I, the personification of the United States, declare war on the Empire of Japan." As soon as he declared war on the Empire of Japan, the room's temperature had dropped.

Germany paled, no no no, this is not what he had planned. "Oh, fick."

America smiled darkly, "Mark my word, Empire of Japan; you will lose. You will not get any mercy from me."

Empire of Japan scoffed, "I won't be so arrogant if I were you. I, Empire of Japan, won't lose to a scum."

America laughed loudly and then glared at the Empire of Japan with a full of hate. "You made a big mistake to hurt my youngest children and my innocent citizens. That is unforgivable!" America spat. "I will see you on the field," he added, venomously, as he stormed off with a pissed-off look.

-During the final stage of World War Two-

"America," spoke the US President on the radio, "are you ready to drop the little boy in Hiroshima?"

America grinned like a crazed man, "hell yeah, boss." He spoke and turned his head, facing the pilot, "let drop the little boy."

The pilot nodded and then pressed the button to drop the little boy.

"Pull back!" America bellowed.

"Yes, sir!"

The pilot turned the plane around and as quickly as possible, leaving ground zero. In the next minute, the air was quiet, and then, there was an explosion of light.

KAAAA-BOOOOM!

The plane shook violently by the impact. The smoke revealed flames, and every area, was wiped out. It was a frightening sight to see.

America glared at the flame coldly. However, the more he stares at it, his eye's color changes from crimson to blue. Alfred stumbled a little as if a spirit possession had left his body and groaned, rubbing his head in discomfort.

"Ugh…" Alfred groaned. "What happened?"

"Alfred! You are not going to believe it—we finally did it!" The pilot exclaimed. "We made history!"

Alfred frowned; who is this guy? Or even why he is on a plane? The last thing Alfred remembered was when Alfred had witnessed his youngest child being injured by a surprise attack at Pearl Harbor. All he could remember was rage. And then he blacked out.

"Uhm, what do you mean by that?" Alfred questioned.

The pilot rolled his eyes, "look outside at Hiroshima!" And so, Alfred looked out of the window, and he only saw flames and destruction. Alfred gaped in horror at the destruction. "What the date?" He questioned nervously.

The pilot blinked. "Did you hit your head in the turbulence? It is August 6th, 1945."

'Oh shit,' Alfred thought. 'My other self had possessed me over four years…Japan is going to lose his shit when he learns about this.'

Bonus:

Japan coughed with blood coming out of his mouth as he clenched his heart, "fuck!" he howled in pain. It was the worst pain he had ever experienced since 1923.