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The Monroe Doctrine a principle of US policy, originated by President James Monroe in 1823, that any intervention by external powers in the politics of the Americas is a potentially hostile act against the US. The historical significance of this is that the US had a high imperialist mindset which created tensions between them and opposing countries. The Europeans did not really care for the Monroe Doctrine.

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The Compromise of 1850: January 29, 1850

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The Compromise of 1850: January 29, 1850

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The Compromise of 1850 is a set of laws, passed in the midst of fierce wrangling between groups favoring slavery and groups opposing it, that attempted to give something to both sides. The compromise admitted California to the United States as a “free” state but allowed some newly acquired territories to decide on slavery for themselves. The historical significance is that even after having a "compromise", tensions between those for and against slavery grew even larger.

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Uncle Tom's Cabin is is an anti-slavery novel by American author Harriet Beecher Stowe. It tells the story of Uncle Tom, an enslaved person, depicted as saintly and dignified, noble and steadfast in his beliefs. The historical significance is that this book helped shift a lot of the minds of people in the North and strengthened the belief that slavery is immoral.

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Bleeding Kansas a series of violent civil confrontations in Kansas Territory, and to a lesser extent in western Missouri, between 1854 and 1859. It emerged from a political and ideological debate over the legality of slavery in the proposed state of Kansas. The historical significance is Kansas became a free-state after the disagreement of political and racial views.

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The Dred Scott decision was when the Supreme Court held that no African-American could be a citizen entitled to sue in federal court and that no African-American could become free simply because he was taken into a free state by his owner. The historical significance is this set back progression for African Americans and their way to freedom and being their own person.

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Lincoln's election marked the first time ever that a Republican was elected president. His victory made him the first president to win re-election since Andrew Jackson in 1832, as well as the first Northern president to ever win re-election. The historical significance is this was a jump start to the Civil War because of the growing Republican influence in the US, like Lincoln's opposition to the expansion of slavery.

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The Civil War was a four-year war between the United States and 11 Southern states that seceded from the Union and formed the Confederate States of America. The ensuing outbreak of armed hostilities was the culmination of decades of growing sectional friction over slavery. The historical significance is the North wanted to help the South and be peaceful after the war was finished.

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The Gettysburg Address is a speech delivered in 1863 by U.S. President Abraham Lincoln at the dedication of the National Cemetery at Gettysburg, Pennsylvania, the site of one of the most decisive battles of the American Civil War. The historical significance of the speech is that Lincoln wanted to bring together the country and express that the union needs to be saved. Also, the lives lost in the war was not taken for granted and they are commemorated.

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The Reconstruction Acts were four statutes passed during the Reconstruction Era by the 40th United States Congress addressing the requirement for Southern States to be readmitted to the Union. The historical significance is the South was given a chance to rejoin the union, but they refused because African Americans were also given more rights and no more slavery.

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The purchase of Alaska was the United States' acquisition of Alaska from the Russian Empire. The historical significance is this purchase helped end the precense of Russia in the US and ensured the US to have access to the Pacific northern rim.

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A telephone is an instrument designed for the simultaneous transmission and reception of the human voice.  It is an important device for facilitating human communication.

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The Haymarket affair, also known as the Haymarket massacre, the Haymarket riot, the Haymarket Square riot, or the Haymarket Incident, was the aftermath of a bombing that took place at a labor demonstration on May 4, 1886, at Haymarket Square in Chicago, Illinois, United States.

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allowed the federal government to break up tribal lands. The purpose of the Dawes Act, and the subsequent acts that extended its initial provisions, was purportedly to protect American Indian property rights, particularly during the land rushes of the 1890s.

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widespread railroad strike and boycott that severely disrupted rail traffic in the Midwest of the United States in June–July 1894.  the Pullman Strike demonstrated the power of the labour movement.

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The Court's “separate but equal” decision in Plessy v. Ferguson on that date upheld state-imposed Jim Crow laws. It became the legal basis for racial segregation in the United States for the next fifty years

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Spanish American War: April 21, 1898 – December 10, 1898

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Spanish American War: April 21, 1898 – December 10, 1898

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an 1898 conflict between the United States and Spain that ended Spanish colonial rule in the Americas and resulted in U.S. acquisition of territories in the western Pacific and Latin America.  produced a peace treaty that compelled the Spanish to relinquish claims on Cuba, and to cede sovereignty over Guam, Puerto Rico, and the Philippines to the United States.

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America's annexation of Hawaii in 1898 extended U.S. territory into the Pacific and highlighted resulted from economic integration and the rise of the United States as a Pacific power. the Hawaiian islands were officially annexed by the United States.

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McKinley Assassination: September 14, 1901

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McKinley Assassination: September 14, 1901

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William McKinley, the 25th president of the United States, was shot on the grounds of the Pan-American Exposition at the Temple of Music in Buffalo, New York, on September 6, 1901, six months into his second term. He regarded McKinley as a symbol of oppression and was convinced that it was his duty as an anarchist to kill him.

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Construction of Panama Canal Begins: May 4, 1904

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Construction of Panama Canal Begins: May 4, 1904

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President Theodore Roosevelt oversaw the realization of a long-term United States goal—a trans-isthmian canal.  The Canal was a geopolitical strategy to make the United States the most powerful nation on earth.

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Teddy Roosevelt wins Nobel Peace Prize: December 10, 1906

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Teddy Roosevelt wins Nobel Peace Prize: December 10, 1906

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Theodore Roosevelt, President of the USA, received the Peace Prize for having negotiated peace in the Russo-Japanese war in 1904-5.  having negotiated peace in the Russo-Japanese war in 1904-5.