Natural resources
Copper
Copper is a chemical element with the symbol Cu and atomic number 29.
Forest
Four different seasons with warm summers and Cold and wet winters.
Rocky Mountains
The Rocky Mountains stretch some 3,000 miles from British Columbia and Alberta in Canada through Idaho, Montana, Wyoming, Colorado, and down to New Mexico in the U.S.
World War I
World War I, also known as the First World War, the Great War, the Seminal Catastrophe, and initially in North America as the European War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
silver
Silver has thousands of industrial uses and is considered by investors as a store of wealth. Silver is produced as a by product when mining other metals
Coniferous forest
Cold and dry with snowy winters and warm summers.
Mississippi River
The Mississippi River is the second-longest river and chief river of the second-largest drainage system on the North American continent, second only to the Hudson Bay drainage system.
The American Revolution
The American Revolution was a colonial revolt which occurred between 1765 and 1783. The American Patriots in the Thirteen Colonies defeated the British in the American Revolutionary War with the assistance of France.
Iron ores
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red.
Mediterranean
Warm temperatures with rainfall in the fall and winter.
The Great Lakes
The Great Lakes, also called the Laurent Great Lakes and the Great Lakes of North America, are a series of interconnected freshwater lakes primarily in the upper mid-east region of North America.
World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries including all the great powers eventually formed two opposing military alliances: the Allies and the Axis.
Petroleum
liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosene, and diesel oil.
Grassland
Hot summers and cold winters with rainfall.
Canadian Shield
The Canadian Shield, also called the Laurent Plateau, or Bounclier Canadian, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks that forms the ancient geological core of the North American continent.
Tearing Down of the Berlin Wall
On June 12, 1987 more than 25 years after the Berlin Wall first divided the city's East and West U.S. President Ronald Reagan gave a famous speech in front of the Brandenburg Gate in Berlin, challenging his Soviet counterpart Mikhail Gorbachev by declaring, Mr. Gorbachev said, tear down this wall.”
Bauxite
Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium.
Tundra
Winters are very cold, summers are warm and there is little rain.
Lake Erie
Lake Erie is the fourth-largest lake of the five Great Lakes in North America, and the eleventh-largest globally if measured in terms of surface area.
The Reformation
The Reformation was a movement within Western Christianity in the sixteenth-century Europe that posed a religious and political challenge to the Roman Catholic Church and papal authority in particular.