Without seeing the map you are referring to, I can’t provide a definitive answer. However, I can offer some information about the potential options:
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The boundary of the Aztec empire: This would reflect the geographical limits of the territory controlled by the Aztec civilization in Mesoamerica.
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The route of Christopher Columbus: This would indicate the path taken by Columbus during his voyages to the New World.
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The Line of Demarcation: Established by the Treaty of Tordesillas in 1494, this line was meant to divide the newly discovered lands outside Europe between Spain and Portugal.
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The prime meridian: This is the planet's line of 0 degrees longitude, running from the North Pole to the South Pole.
You will need to look at the context of the map to determine which option correlates with the line shown. If it shows geographical boundaries of ancient civilizations, it’s likely the Aztec boundary. If it indicates exploration paths, it may refer to Columbus’s route. If it’s related to colonial territories, it could be the Line of Demarcation. If it shows longitude, it’s the prime meridian.