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Russian grand duchess Anastasia; undated photograph. (Anastasiya Nikolayevna, Tsar Nicholas II)
Did Duchess Anastasia Survive Her Family’s Execution?
Super Typhoon Noru over the western tropical Pacific Ocean as observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA Aqua satellite July 31 2017
What Is the Difference Between a Typhoon and a Super Typhoon?
bunch of numbers
Unusual Counting Systems
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
A group of diverse individuals, who represent various occupations, stand with their arms raised in the air. labor day; laborers; construction worker; teacher; nurse; doctor; assistant; office staff; blue collar; workforce
Why Is Labor Day Celebrated in September?
Chapter 4 pg 42 - Chapter header of The Adventures of Tom Sawyer by Mark Twain. Published in 1884 by The American Publishing Company
Periods of American Literature
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution

hollow core

Mexican geography

Learn about this topic in these articles:

San Luis Potosí

  • San Luis Potosi, Mexico. Locator map: boundaries, cities.
    In San Luis Potosí

    …part of Mexico’s so-called “hollow core” because many residents have left to seek jobs in the Federal District, along the U.S.-Mexican border, or farther north. Area 24,351 square miles (63,068 square km). Pop. (2020) 2,822,255.

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Zacatecas

  • The city of Zacatecas, Zacatecas state, Mex.
    In Zacatecas

    …part of Mexico’s so-called “hollow core” as many of its residents moved elsewhere, seeking work in the United States, along the U.S.-Mexican border, or in the Federal District. The rail, highway, and air routes traversing the state link Zacatecas city with El Paso (Texas) and Mexico City. Area 28,283…

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