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A country extending its power by the acquisition of territories.

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A process of capturing a territory

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The Alaska Purchase was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867

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Yellow journalism, or the yellow press, is a US term for a type of journalism that presents little or no legitimate well-researched news and instead uses eye-catching headlines to sell more newspapers.

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The Foraker Act, Pub.L. 56–191, 31 Stat. 77, enacted April 12, 1900, officially known as the Organic Act of 1900, is a United States federal law that established civilian (albeit limited popular) government on the island of Puerto Rico

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On March 2, 1901, the Platt Amendment was passed as part of the 1901 Army Appropriations Bill. It stipulated seven conditions for the withdrawal of United States troops remaining in Cuba at the end of the Spanish–American War, and an eighth condition that Cuba sign a treaty accepting these seven conditions.

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The Open Door Policy is a term in foreign affairs initially used to refer to the United States policyestablished in the late 19th century and the early 20th century, as enunciated in Secretary of State John Hay's Open Door Note, dated September 6, 1899 and dispatched to the major European powers.

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The Boxer Rebellion, Boxer Uprising or Yihetuan Movement was a violent anti-foreign, anti-colonial, and anti-Christian uprising that took place in China between 1899 and 1901, toward the end of the Qing dynasty.

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The Roosevelt Corollary was an addition to the Monroe Doctrine articulated by President Theodore Roosevelt in his State of the Union address in 1904 after the Venezuela Crisis of 1902–03.

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Was a form of American foreign policy to further its aims in Latin America and East Asia through use of its economic power by guaranteeing loans made to foreign countries.

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Nationalism is a political, social, and economic system characterized by promoting the interests of a particular nation, particularly with the aim of gaining and maintaining self-governance, or full sovereignty, over the group's homeland

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“domination of the military man over the civilian, an undue preponderance of military demands, an emphasis on military considerations”.

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The Triple Entente was the understanding linking the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland after the signing of the Anglo-Russian Entente on 31 August 1907.

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The Central Powers consist of Austria-Hungary, Germany, Bulgaria and the Ottoman Empire. Invadors

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Trench warfare is a type of land warfare using occupied fighting lines consisting largely of military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery.

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a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the prior event of the United States entering World War I against Germany.

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The Selective Service System is an independent agency of the United States government that maintains information on those potentially subject to military conscription.

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The War Industries Board was a United States government agency established on July 28, 1917, during World War I, to coordinate the purchase of war supplies between the War Department and the Navy Department.

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The Committee on Public Information, also known as the CPI or the Creel Committee, was an independent agency of the government of the United States created to influence public opinion to support US participation in World War I.

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prohibited many forms of speech, including "any disloyal, profane, scurrilous, or abusive language about the form of government of the United States .

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The Fourteen Points was a statement of principles for peace that was to be used for peace negotiations in order to end World War I

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The League of Nations was an intergovernmental organisation founded on 10 January 1920 as a result of the Paris Peace Conference that ended the First World War.

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The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end.