This motif/feature was declared closed in 1893, fundamentally shaping American expansion and leading toward American Imperialism.
What is the frontier?
This 1920 constitutional amendment expanded voting rights to women nationwide, representing one of the largest changes in the Progressive Era.
What is the 19th Amendment?
This 1919 peace treaty officially ended WWI, but was rejected by the Senate.
What is the Treaty of Versailles
This 1896 (yeah I know the date isn't in this time period) Supreme Court case established the doctrine of "separate but equal," giving legitimacy to racial segregation laws.
What is Plesssy v. Ferguson?
This number, represented by the greek letter phi, can be represented as: 
What is the golden ratio (1.618033...)?
The 1899 US Open Door Policy sought to ensure equal trading rights in this country while preventing European powers from colonizing it.
What is China?
This 1933 reform from FDR was one of his first actions after being in office, aiming to restore public confidence after bank failures.
What is the Bank Holiday (Emergency Banking Act)?
This was President Wilson's 1918 plan for peace following WWI, promoting self-determination and a League of Nations that would help secure demilitarization, diplomacy, and international cooperation to prevent further war.
What are the Fourteen Points?
This was the name of the first satellite launched into space (in 1957), stirring up fears of American technological inferiority in the Cold War.
What is Sputnik?
This is the only song in Spotify history to have both its original version and a remix achieve over 2 billion streams each.
What is "Save Your Tears" by The Weeknd, with a remix featuring Ariana Grande?
In 1911, a fire at this New York City factory killed more than 100 workers and exposed many unsafe conditions of laborers, leading to more safety reforms.
What is the Triangle Shirtwaist Factory (Triangle Shirtwaist Fire)?
This 1913 major piece of legislation allowed for direct election of US senators, reducing the political power and influence of party machines.
What is the 17th Amendment?
This 1941 law, passed before the US officially entered WWII, allowed the US to supply Allied nations with military aid without direct involvement.
What is the Lend-Lease Act?
This 1965 event was one of the turning points in the Civil Right Movement because of its violence, also demonstrating the use of media for political or social change.
What is Bloody Sunday?
This university exists due to a murder plot gone wrong.
After this university's founder willed his wealth to the creation of a university, he was killed by his valet and lawyer, who forged a fake will, only for their scheme to unravel because they misspelled his name on a check.
What is Rice University?
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This 1935 New Deal program guaranteed workers the right to unionize and collectively bargain, marking a shift in power between laborers and employers.
What is the Wagner Act (National Labor Relations Act)?
The sinking of this ship in 1915 was a reflection of the larger German unrestricted u-boat warfare that led to US entry into WWI. The 1917 Zimmerman Telegram also added to shifting American opinion toward entering WWI.
What is the sinking of the RMS Lusitania?
Although this 1968 military campaign was a military victory, it was a strategic loss because it intensified public opposition to the Vietnam War and started the beginning of US withdrawal.
What is the Tet Offensive?
Must get both parts to be correct:
1. This early 1900s foreign policy by President Taft emphasized American investment abroad to expand influence without military force.
2. This 1910s foreign policy by President Wilson emphasized the US' moral responsibility to promote democracy and moral governance abroad.
What is Dollar Diplomacy and Moral Diplomacy?
This 1890 law was passed to regulate monopolies, but early enforcement often targeted labor unions rather than corporations.
What is the Sherman Antitrust Act?
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This 1919-20 series of raids aimed to capture and arrest suspected socialists, especially anarchists and communists, often to deport them.
What are the Palmer Raids (during the First Red Scare)?
This 1991 military operation from a US-led coalition expelled Iraqi forces from Kuwait, ending the combat of the Gulf War.
What is Operation Desert Storm?
This 1892 labor conflict arose after Henry Clay Frick attempted to break the Amalgamated Association of Iron and Steel Workers union, involving the Pinkerton guards.
What is the Homestead Strike (against Carnegie Steel)?