The question seems incomplete, but assuming you're referring to World War II, the most effective army in the fight against the Japanese was arguably the United States Armed Forces. Here's a step-by-step breakdown:

1. The United States entered World War II after the Japanese attack on Pearl Harbor in December 1941.

2. The U.S. mobilized its vast resources and began a two-front war, fighting both Germany in Europe and Japan in the Pacific.

3. In the Pacific theater, the U.S. Navy, in particular, played a crucial role. The Battle of Midway in June 1942, where the U.S. Navy decisively defeated an attacking fleet of the Imperial Japanese Navy, is often considered the turning point in the Pacific War.

4. The U.S. also conducted a successful island-hopping campaign, gradually taking over strategic islands and getting closer to Japan.

5. The U.S. Army Air Forces carried out a strategic bombing campaign against Japan, culminating in the dropping of two atomic bombs on Hiroshima and Nagasaki in August 1945.

6. Faced with the prospect of an invasion by the U.S. and its allies, and the shock of the atomic bombings, Japan surrendered in August 1945.

While other Allied forces, such as those from the British Commonwealth, China, and the Dutch East Indies, also fought against Japan, the U.S. played the most significant role in defeating Japan.

Question

The question seems incomplete, but assuming you're referring to World War II, the most effective army in the fight against the Japanese was arguably the United States Armed Forces. Here's a step-by-step breakdown:

1. The United States entered World War II after the Japanese attack on Pearl Harbor in December 1941.

2. The U.S. mobilized its vast resources and began a two-front war, fighting both Germany in Europe and Japan in the Pacific.

3. In the Pacific theater, the U.S. Navy, in particular, played a crucial role. The Battle of Midway in June 1942, where the U.S. Navy decisively defeated an attacking fleet of the Imperial Japanese Navy, is often considered the turning point in the Pacific War.

4. The U.S. also conducted a successful island-hopping campaign, gradually taking over strategic islands and getting closer to Japan.

5. The U.S. Army Air Forces carried out a strategic bombing campaign against Japan, culminating in the dropping of two atomic bombs on Hiroshima and Nagasaki in August 1945.

6. Faced with the prospect of an invasion by the U.S. and its allies, and the shock of the atomic bombings, Japan surrendered in August 1945.

While other Allied forces, such as those from the British Commonwealth, China, and the Dutch East Indies, also fought against Japan, the U.S. played the most significant role in defeating Japan.

Knowee AI · Accepted Answer