Which event had the immediate effect of causing germany to declare war on the allies?

a)the berlin conference of 1885 sets off the “scramble for africa.”

b)russia mobilizes its forces on germany’s eastern borders.

c)great britain declares war on germany.

(d)the austrian archduke is assassinated.

B) Russia mobilizes its forces on Germany’s eastern borders.

Explanation:

The war causes of the outbreak of the Second World War are, in the West, the invasion of Poland by the German troops and, in the East, the Japanese invasion of China, the British, Dutch colonies and later the attack on Pearl Harbor.

The Second World War broke out after these aggressive actions received in response a declaration of war, armed resistance or both, by the countries attacked and those with whom they maintained treaties. At first, the allied countries were formed only by Poland, the United Kingdom and France, while the Axis forces were constituted solely by Germany and Italy in an alliance called the Steel Pact.

As the war progressed, the countries that were entering it (due to being attacked or having treaties with the aggressed countries) were aligned on one of the two sides, depending on each situation. That was the case of the United States and the USSR, attacked respectively by Japan and Germany. Some countries, such as Hungary or Italy, changed their alliances in the final phases of the war.

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the space race was a battle to make advanced technology to get to the moon and to get a better understanding of space.