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The Louisiana purchase of 1803 was bought the U.S. about 828,000 square miles (2,144,520 square km) from France. It was less than 3 cents making this a greatest bargain in U.S. History. This purchase made double the size of U.S it greatly strengthened the country materially and strategically since its provided by a powerful impetus (Impetus- a driving force)
to the westward expansion, and the doctrine (Doctrine- a principle or position or the body of principles in a branch of Knowledge or system of belief) of implied powers of the federal Constitution.

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The Mexican-American war is also called Mexican War, Spanish Guerra De 1847 or Guerra de Estados Unidos a Mexico (Translation: War of the United States against Mexico). The war between the U.S. and Mexico in April 1846 to February 1848 stemming (Stemming- originate or caused by) from the U.S.'s annexation of Texas  in 1845 and from a dispute over whether Texas ended the Nueces River claimed by Mexico or the Rio grade claimed by U.S. The U.S. forces keeps on winning resulting in U.S expand more that 500,000 square miles that's about 1,300,000 square km of the Mexican territory extending westward from Rio grande to the Pacific Ocean.

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The French decided to join the British Expedition with a excuse of the murder of a French Missionary in China in the early 1856 later on the allies began military operation in 1857. They quickly captured Canton deposed the city's intransigent (Intransigent- characterized by refusal to comprise or to abandon an often extreme position or attitude: Uncompromising) governor and installed a more-compliant official. In May 1858 allied troops in British warships reached Tianjin and forces China into negotiations.

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1860 - First Japanese Mission is sent to the U.S

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1860 - First Japanese Mission is sent to the U.S

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In 1860 the Japanese government sent their first diplomatic mission to United States. The official mission was to ratify (Ratify- to approve and sanction formally) the Treaty of Friendship, (The treaty of friendship is closing the ties between the two countries) which it was signed several years earlier. The agreement opened the ports of Edo (city in southeast Honshu, Japan, Tokyo Bay population 8,945,695 and four Japanese cities to American trade. The Japanese people were captivated to the citizen in American even the press.

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The Spanish-American war is a conflict between two countries that ended the Spanish colonial rule in America, resulting U.S to gain the territories in the western Pacific and Latin America. The reason why U.S. declared a war to Spain so the war originated in Cuba and it was struggling for its independence from Spain which in started in 1895. Spain is being repressive to end the rebellion and later on it was portrayed to the Americans by several sensational newspapers engaging in yellow journalism (Yellow journalism is a fake news to increase its sale) and Americans sympathy grew for Cuba. After that the growing demand for U.S invention became an insistent after the unexplained explosion USS Maine.

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The Gentleman's Agreement is a an agreement between Japan and U.S in 1907 was an informal agreement that America and Japan whereby Japan would now allow further emigration to United States and United States wouldn't force restriction for the people who immigrants in the U.S.

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1917 - American combat forces arrives in France

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1917 - American combat forces arrives in France

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During World War 1, The first 14,000 landed on France at the Port of Saint-Nazaire. The landing site was kept as a secret because due to the threats from German but when they finally stepped in they were welcomed by a huge lively crowd but the "Doughboys" the British referred it as the Green American, were untrained, poorly equipped and unprepared for the struggles of fighting the Western Front.

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1918 - U.S forces are victories in the battle of Cantigny

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1918 - U.S forces are victories in the battle of Cantigny

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In the first  American offense, which lasted in World War I, Allied forces, including an American brigade nearly 4,000 men, capture the town of Cantigny on the Somme in France from  German's enemy forces. The United States officially entered WW1 on the side Allies in April 1917, but they were not fully prepared to sent significant numbers of troops into the battle until 1918. By May 1918, large numbers of American troops arrived in France, perfect timing to face the onslaught of the great German Spring offensive.

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On January 18, 1919, the world's most powerful leaders met in Paris, France, to begin long and difficult negotiations that officially marked the end of WW1. For most conference , US president Woodrow Wilson maintained the idea "peace without victory" and struggled to reassure Germany, the leader of the central powers and a major loser in the War, was not treated too harshly.

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1921 - U.S. signs separate peace treaties. 

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1921 - U.S. signs separate peace treaties. 

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It was signed in Berlin on 25th of August 1921, after the war, the main reason for this treaty was that the US senate didn't agree with the idea of ratifying the multilateral peace treaty signed in Versailles so later they separate treaty and signed separately.