Geography
This imaginary line sits at $0^\circ$ latitude and divides the Earth into the Northern and Southern Hemispheres.
What is the Equator?
Adopted on July 4, 1776, this historic document formally severed the American colonies' political ties to Great Britain.
What is the Declaration of Independence?
This devastating economic downturn began with the 1929 stock market crash and lasted through most of the 1930s.
What is the Great Depression?
This ancient river valley civilization is famous for its pharaohs, hieroglyphic writing, and the construction of monumental pyramids.
What is Ancient Egypt?
Invented by Johannes Gutenberg around 1440, this device revolutionized global communication by allowing the mass production of books.
What is the movable-type printing press?
Unlike a physical map, this type of map focuses on man-made boundaries, country borders, and major cities.
What is a political map?
Bought from France in 1803 for $15 million, this massive land acquisition instantly doubled the size of the United States.
What is the Louisiana Purchase?
This decades-long era of geopolitical tension and proxy wars pitted the United States against the Soviet Union following World War II.
What is the Cold War?
Developed in the ancient Greek city-state of Athens, this system of government allows citizens to vote directly on laws and policies.
What is direct democracy?
This 18th-century European intellectual movement emphasized reason, individualism, and science over traditional religious authority.
What is the Enlightenment?
This horseshoe-shaped region around the Pacific Ocean is home to most of the world's active volcanoes and frequent earthquakes.
What is the Ring of Fire?
Issued by President Abraham Lincoln on January 1, 1863, this executive order declared that all enslaved people in Confederate-held territory were free.
What is the Emancipation Proclamation?
This landmark 1954 Supreme Court case unanimously ruled that racial segregation in public schools was unconstitutional, overturning "separate but equal."
What is Brown v. Board of Education?
This devastating 14th-century pandemic swept across Europe and Asia, killing an estimated one-third to one-half of Europe's population.
What is the Black Death (or Bubonic Plague)?
This German monk sparked the Protestant Reformation in 1517 by famously nailing his "95 Theses" to a church door in Wittenberg.
Who was Martin Luther?
This theme of geography describes the human and physical characteristics that make a specific location unique.
What is "Place"?
This original U.S. constitution was replaced in 1789 because it created a central government that was too weak to tax or regulate trade.
What are the Articles of Confederation?
Ratified in 1920, this Constitutional amendment granted American women the right to vote.
What is the 19th Amendment?
This decentralized political and economic system dominated medieval Europe, relying on a hierarchy of lords, vassals, and serfs.
What is feudalism?
Triggered by the assassination of Archduke Franz Ferdinand, this global conflict devastated Europe from 1914 to 1918.
What is World War I?
This vast geographic feature in Northern Africa is the largest hot desert in the world.
What is the Sahara Desert?
This 1820 legislative compromise maintained the balance of power between slave and free states by admitting Maine as a free state and Missouri as a slave state.
What is the Missouri Compromise?
Coined by Mark Twain, this term describes the late 19th-century era of rapid industrial growth that masked severe underlying social problems and political corruption.
What is the Gilded Age?
This Roman emperor legalized Christianity across the empire with the Edict of Milan in 313 CE and later moved the imperial capital to Byzantium.
Who was Constantine the Great?
Beginning in Great Britain during the late 18th century, this major socioeconomic shift transitioned human manufacturing from hand tools to power-driven machinery.
What is the Industrial Revolution?