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In general discussion, a nation-state is variously called a "country," a "nation," or a "state."

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The United States of America—also referred to as the United States, the USA, the U.S., America, the States, or (archaically) Columbia—is a federal republic of 50 states and the District of Columbia located primarily in central North America.

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Birds (class Aves) are bipedal, warm-blooded, oviparous (egg-laying) vertebrates characterized primarily by feathers, forelimbs modified as wings, and a bony beak without teeth.

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The watershed event of United States history was the American Civil War (1861–1865), fought in North America between 24 mostly northern states of the Union and the Confederate States of America, a coalition of eleven southern states.

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The human body is the physical manifestation of a human being, including the chemical elements, cells, and extracellular materials and the organization of these materials into tissues, organs, and systems.

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Broadly defined, evolution is any heritable change in a population of organisms over time.

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The Inca Civilization (called Tawantinsuyu in modern spelling, and Quechua, or Tahuantinsuyu in old spelling), was an empire located in South America from 1438 c.e. to 1533 c.e.

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The Kingdom of Israel (Hebrew: מַלְכוּת יִשְׂרָאֵל, Standard Hebrew Malkut Yisrael) was the kingdom proclaimed by the Israelite nation around 1030 B.C.E. - 1020 B.C.E., enduring until it fell to the Assyrian empire in 722 B.C.E..

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Islam (Arabic: الإسلام al-islām) "obediance (or submission) to God" is a monotheistic faith, one of the Abrahamic religions, and the world's second largest religion.

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Isabella of Castile (April 22, 1451 – November 26, 1504) was queen of Castile and Aragon and her husband, Ferdinand II of Aragon, were responsible for establishing the foundation for the political unification of Spain that occurred during the reign of their grandson, Carlos I of Spain.

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Ancient Egypt as a general historical term broadly refers to the civilization of the Lower Nile Valley (or the Great Rift Valley) between the First Cataract and the mouths of the Nile Delta, from circa 3300 B.C.E. until the conquest of Alexander the Great in 332 B.C.E..

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Globalization, as a concept, refers both to the "shrinking" of the world and the increased consciousness of the world as a whole.

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Epicurus (Epikouros or Ἐπίκουρος in Greek) (341 B.C.E. – 270 B.C.E.) was an ancient Greek philosopher, the founder of Epicureanism, one of the most popular schools of Hellenistic Philosophy.

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Cleopatra VII Philopator (January, 69 b.c.e. – August 12, 30 b.c.e.) was queen of Ancient Egypt, the last member of the Macedonian Ptolemaic dynasty and hence the last Greek ruler of Egypt.

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A disease is an abnormal condition or impairment of the body of an organism, including any of its organs, systems, or parts, and that has a specific cause and characteristic signs or symptoms.

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Trees are the largest plants. They are not a single taxon (unit of biological classification) but include members of many plant taxa.

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Biology is the "science of life." It is the study of living and once-living things, from submicroscopic structures in single-celled organisms to entire ecosystems with millions of interacting organisms, whether the life history of one individual or the course of many species over eons of time.

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Aztec calendar stone

The Aztecs were a Mesoamerican people of central Mexico in the fourteenth, fifteenth, and sixteenth centuries.

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Moses or Móshe (מֹשֶׁה, Hebrew), was the Hebrew liberator, prophet and lawgiver, who according to the Bible, and the Qur'an (by his Arabic name Musa), freed the Hebrew slaves from Egypt and at Mount Sinai provided the them with the Mosaic Law, or Torah, including the Ten Commandments.

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Ecology or ecological science, is the scientific study of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment.

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