What were the stategies of the axis powers during WW11 used to build up their countries?

Also, Why did we use the atom bomb and what were the other options?

I don't really understand your first question. During the war, the Axis Powers conquered other nations, and were not especially interested in "building up their countries. However, these sites may help you.

http://www.battle-fleet.com/pw/his/Axis%20Powers%20WW2%20Pact%20of%20Steel.htm

http://www.h-net.org/reviews/showrev.cgi?path=7211160422131

We used the atomic bomb because we had it and no other country had one at that time. The argument given was that Japan wasn't going to surrender unless we used extreme force. The alternative to using the bomb was to invade Japan which would have resulted in a horrific loss of lives on both sides. It probably would have also devastated Japan's infrastructure.

To understand the strategies of the Axis powers during World War II, you can examine the following steps:

1. Economic Expansion: Germany, Italy, and Japan aimed to expand their economies by acquiring resources and establishing new markets through territorial conquest. They sought control over key resources like oil, rubber, iron, and food to fuel their war machines and sustain their populations.

2. Militarization: The Axis powers heavily emphasized military buildup and modernization. They focused on aircraft, armored vehicles, submarines, and other advanced weaponry to maintain military superiority and expand their influence.

3. Territorial Expansion: Hitler aimed to create a 'Greater Germany' by annexing nearby territories. Italy under Mussolini sought to restore the Roman Empire, while Japan aimed to establish a 'Greater East Asia Co-Prosperity Sphere,' expanding its territories in Asia and the Pacific.

4. Alliances: Axis powers formed alliances to strengthen their military and political positions. The Axis pact between Germany, Italy, and Japan cemented their partnership, allowing for mutual support and coordination.

Regarding the use of the atomic bomb during World War II, it can be attributed to a combination of factors:

1. Ending the War: The immediate objective was to conclude the war with Japan swiftly and avoid a land invasion of Japan, which was projected to result in high casualties for both sides.

2. Saving Lives: The decision to drop the atomic bomb was primarily based on the belief that it would lead to a quicker Japanese surrender, ultimately saving lives in the long run. By demonstrating the devastating power of the bomb, the hope was that Japan would be compelled to surrender.

3. Sending a Message: The use of the atomic bomb aimed to send a strong message to the rest of the world, especially the Soviet Union, showcasing the United States' military capabilities and deterring future conflicts.

As for alternative options, there were several considered but ultimately not pursued:

1. Continuation of Conventional Bombing: The United States was already heavily bombing Japanese cities, causing significant damage. By intensifying conventional bombing, it was possible to further weaken Japan's industrial and military infrastructure without using atomic weapons.

2. Demonstration of Atomic Power: Some suggested conducting a demonstration of the atomic bomb's power to Japanese leadership, hoping to convince them to surrender. However, concerns arose that such a demonstration might not be enough to ensure Japanese capitulation.

3. Continued Blockade and Economic Warfare: The United States could have chosen to continue its blockade and economic restrictions, which were progressively weakening Japan's ability to sustain its war effort. This approach relied on attrition, hoping Japan would surrender once its resources were depleted.

It's essential to note that these decisions were highly controversial and debated both at the time and in subsequent historical analysis.