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Portal:North America

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North America is a continent in the Northern and Western Hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. The region includes the Bahamas, Bermuda, Canada, the Caribbean, Central America, Clipperton Island, Greenland, Mexico, Saint Pierre and Miquelon, Turks and Caicos Islands, and the United States.

North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), representing approximately 16.5% of the Earth's land area and 4.8% of its total surface area. It is the third-largest continent by size after Asia and Africa, and the fourth-largest continent by population after Asia, Africa, and Europe. As of 2021, North America's population was estimated as over 592 million people in 23 independent states, or about 7.5% of the world's population. In human geography, the terms "North America" and "North American" can refer to Canada, the United States, Mexico, and Greenland or, alternatively, Canada, Greenland and the US (Mexico being classified as part of Latin America) or simply Canada and the US (Greenland being classified as either Arctic or European (due to its political status as a part of Denmark) and Mexico classified as Latin American).

It is unknown with certainty how and when first human populations first reached North America. People were known to live in the Americas at least 20,000 years ago, but various evidence points to possibly earlier dates. The Paleo-Indian period in North America followed the Last Glacial Period, and lasted until about 10,000 years ago when the Archaic period began. The classic stage followed the Archaic period, and lasted from approximately the 6th to 13th centuries. Beginning in 1000 AD, the Norse were the first Europeans to begin exploring and ultimately colonizing areas of North America.

In 1492, the exploratory voyages of Christopher Columbus led to a transatlantic exchange, including migrations of European settlers during the Age of Discovery and the early modern period. Present-day cultural and ethnic patterns reflect interactions between European colonists, indigenous peoples, enslaved Africans, immigrants from Europe, Asia, and descendants of these respective groups. (Full article...)

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Approximate location of the Republic of Fredonia

The Fredonian Rebellion or Texan revolt of 1826 (December 21, 1826 – January 31, 1827) was the first attempt by Texans to secede from Mexico. The settlers, led by Empresario Haden Edwards, declared independence from Mexican Texas and created the Republic of Fredonia near Nacogdoches. The short-lived republic encompassed the land the Mexican government had granted to Edwards in 1825 and included areas that had been previously settled. Edwards's actions soon alienated the established residents, and the increasing hostilities between them and settlers recruited by Edwards led Víctor Blanco of the Mexican government to revoke Edwards's contract.

In late December 1826, a group of Edwards's supporters took control of the region by arresting and removing from office several municipality officials affiliated with the established residents. Supporters declared their independence from Mexico. Although the nearby Cherokee tribe initially signed a treaty to support the new republic because a prior agreement with the Mexican government negotiated by Chief Richard Fields was ignored, overtures from Mexican authorities and respected empresario, Stephen F. Austin, convinced tribal leaders to repudiate the rebellion. On January 31, 1827, a force of over 100 Mexican soldiers and 275 Texian Militia marched into Nacogdoches to restore order. Haden Edwards and his brother Benjamin Edwards fled to the United States. Chief Fields was killed by his own tribe. A local merchant was arrested and sentenced to death but later paroled. (Full article...)

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Olympic Stadium, Montreal
Olympic Stadium, Montreal
Credit: Acarpentier
The Olympic Stadium in Montreal, Quebec, Canada, at night. The stadium was originally built for the 1976 Summer Olympics and its inclined tower, called la tour de Montréal, is the tallest inclined tower in the world at 175 m (574 ft) and is a member of the World Federation of Great Towers.
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Putnam in 2006

Hilary Whitehall Putnam (/ˈpʌtnəm/; July 31, 1926 – March 13, 2016) was an American philosopher, mathematician, computer scientist, and figure in analytic philosophy in the second half of the 20th century. He contributed to the studies of philosophy of mind, philosophy of language, philosophy of mathematics, and philosophy of science. Outside philosophy, Putnam contributed to mathematics and computer science. Together with Martin Davis he developed the Davis–Putnam algorithm for the Boolean satisfiability problem and he helped demonstrate the unsolvability of Hilbert's tenth problem.

Putnam applied equal scrutiny to his own philosophical positions as to those of others, subjecting each position to rigorous analysis until he exposed its flaws. As a result, he acquired a reputation for frequently changing his positions. In philosophy of mind, Putnam argued against the type-identity of mental and physical states based on his hypothesis of the multiple realizability of the mental, and for the concept of functionalism, an influential theory regarding the mind–body problem. In philosophy of language, along with Saul Kripke and others, he developed the causal theory of reference, and formulated an original theory of meaning, introducing the notion of semantic externalism based on a thought experiment called Twin Earth. (Full article...)

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A pyramid on the 5th terrace of the Acropolis at Toniná.

Tonina (or Toniná in Spanish orthography) is a pre-Columbian archaeological site and ruined city of the Maya civilization located in what is now the Mexican state of Chiapas, some 13 km (8.1 mi) east of the town of Ocosingo.

The site is medium to large, with groups of temple-pyramids set on terraces rising some 71 metres (233 ft) above a plaza, a large court for playing the Mesoamerican ballgame, and over 100 carved monuments, most dating from the 6th century through the 9th centuries AD, during the Classic period. Toniná is distinguished by its well preserved stucco sculptures and particularly by its in-the-round carved monuments, produced to an extent not seen in Mesoamerica since the end of the much earlier Olmec civilization. Toniná possesses one of the largest pyramids in Mexico; at 74 metres (243 ft) in height, it is taller than the Pyramid of the Sun at Teotihuacan. (Full article...)

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Vermont coppers

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Southwestern San Juan Mountains
Southwestern San Juan Mountains
Credit: Debivort
The San Juan Mountains are a rugged mountain range in the Rocky Mountains in southwestern Colorado. The Rio Grande rises on the east side of the range. The San Juan and Uncompahgre National Forest cover a large portion of the San Juan Mountains.

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