In 1915, European powers indeed sought to intensify their military efforts in World War I by increasing the deployment of artillery and troops. However, this escalation did not lead to a quick resolution of the conflict. Instead, the war became bloodier, characterized by significant loss of life and little to no real territorial gains for either the Allies or the Central Powers. The entrenched nature of warfare, particularly on the Western Front, meant that massive offensives often resulted in high casualties without achieving strategic breakthroughs.
The other statements in your question do not accurately reflect the situation at that time. The United States did not enter the war until 1917, and their involvement did contribute to turning the tide in favor of the Allies, but this was not a direct result of events in 1915. Additionally, there were no significant changes in strategy that opened new fronts in the Americas during that period; the primary fronts remained in Europe. Lastly, while Russia did attempt to increase its industrial production, it faced severe challenges, including internal strife and logistical difficulties, which ultimately hampered its war efforts.
In summary, the best description of what happened when European powers increased their military efforts in 1915 is that "The war became bloodier with no real expansion of territory for either side."
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