The 1910s decade covers the period from 1910-1919.
During this decade, Earth experiences several important events, such as the disastrous sinking of the RMS Titanic. (VOY: "Year of Hell") Other disasters include the First World War of the planet. (TOS: "The City on the Edge of Forever"; ENT: "Storm Front, Part II")
During this decade, the actions of Vladimir Lenin and the Bolsheviks set the stage for the formation of the USSR. This decade, however, serves as a front of the Temporal Cold War, and Lenin's assassination prior to this event creates repercussions in the following decades. (ENT: "Storm Front", "Storm Front, Part II")