Naval warfare.
Land warfare.
Artillery.
Chemical warfare.
Mobile warfare.
Aerial warfare
The sinking or Lusitania on 7 May 1915 was a significant event during WW1. It was a passenger liner sunk by German submarine during World War 1. It lead to America declaring war on Germany.
By February 1854, anti-slavery Whigs had begun meeting in the upper midwestern states to discuss the formation of a new party. One such meeting, in Wisconsin on March 20, 1854, is generally remembered as the founding meeting of the Republican Party. Hope I Helped! :)
An empire is a dominating nation with extensive territories and a powerful ruler, such as Rome. Hope this helped!
