(A) By issuing threats against nations in the Western Hemisphere
(B) ** By increasing tensions between the nations of Europe through complicated alliances
(C) By refusing to allow Germany and France to become members
(D) By ignoring aggressive actions by the Japanese in Korea
EXPLANATIONS BELOW
Concept note-1: -Germany, Austria-Hungary and Italy were known as the Triple Alliance. There was also the Triple Entente, an alliance between France, Great Britain and Russia. Alliances helped cause the war because nations would be against each other and they would also want to be dominant.
Concept note-2: -As was the Triple Alliance, the Triple Entente was primarily a pact of mutual self-defense: Each country pledged to come to the military aid of another if that country were attacked. Thus it was that Russia, attacked by Austria-Hungary in 1914, called on Great Britain and France to enter the war.
Concept note-3: -After Austria-Hungary declared war on Serbia, Russia came to Serbia’s aid. This led to Germany joining the war to defend Austria-Hungary and then France and England joining to defend Russia. Due to the alliance system, a war between two nations turned into war throughout an entire continent.
Concept note-4: -It developed from the Franco-Russian alliance that gradually developed and was formalized in 1894, the Anglo-French Entente Cordiale of 1904, and an Anglo-Russian agreement of 1907, which brought the Triple Entente into existence. See also international relations: The Triple Entente.