With numbers of new volunteers declining every month, the British government wrestles with the issue of conscription. Across Europe, all the Great Powers are feeling the manpower and other shortages created by the war.
By the summer of 1915, both the Central Powers and the Allies were keen to get Bulgaria to join the war on their side. The Central Powers won the bidding war, and Bulgaria became the fourth (and last) member of the Central Powers.
By the spring of 1915, it was clear that the war would last for a long time and that it would be taking an economic toll on all the nations involved, and there would likely be political consequences as well. In Britain, the debate centered on whether the government was doing enough to support the French, and in particular, whether British soldiers were being supplied with enough artillery shells to get the job done.
The sinking of Lusitania and the deaths of 128 Americans was a shock. While there was little support in the US for war against Germany, there was a strong feeling that *some* kind of response was necessary. It was up to Woodrow Wilson to figure out what that would be.
Another look at race relations in the USA. The formation of the NAACP and the B'nai B'rith Anti-Defamation League and the re-founding of the Ku Klux Klan. And the release of D.W. Griffith's "The Birth of a Nation."
The phrase "shackled to a corpse" is often used to describe Germany's dilemma in the Great War. Surrounded by enemy nations that collectively have a greater population and larger economies, she also finds herself stuck with a disappointing alliance partner.
By the beginning of the twentieth century, the USA was the major market for Central American coffee, cotton, sugar, and especially bananas, leading to US investment in the region, leading in turn to US involvement in Central American affairs.