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100

 an outdoor theater or performance area, often built into the side of a hill with rows of seats surrounding a central stage



amphitheater 

100

 a bridge or channel built to transport water from one location to another, often over a long distance


aqueduct 

100

 to help or encourage


facilitate 

200

 a public building or large stately church that is round at one end and has columns supporting the roof or dome


basilica 

200

 a strong building material made from a mix of substances


concrete 

200

 the use of science and technology in the design, building, and use of machines, structures, or processes


engineering 

300

 a picture made by painting on wet plaster on a wall or ceiling


fresco

300

 the art or skill of public speaking


oratory 

300

 the movement of people away from their ancestral homeland


diaspora 

400

 believing in or worshiping more than one god


polytheistic 

400

 a person trained or forced to fight other people or animals in an arena in ancient Rome for the entertainment of others


gladiator

400

the spread of people, ideas, technology, and products from one culture to another


cultural diffusion 

500

 a series of horizontal and vertical lines that cross each other to divide an area into sections



grid

500

 a state that is controlled and protected by another

protectorate 

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