The correct answer to this open question is the following.
Unfortunately, you forgot to include the information about page 13, or the excerpt of the text so we could know what is this about. We do not know what was n page 13, just you know it.
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The Tlaxcalan leaders joined the Spanish conquistadors. What this suggests about the relationship between the Tlaxcalans and the Aztecs was that teh Tlaxcalans were enemies of teh Aztecs.
And this is correct because the Aztecs were great warriors that wage war and took prisoners. The Great Aztec Empire was a dominant one, and force other Mesoamerican Indian tribes to pay tribute. So we can say that those other small tribes or less powerful tribes had to pay tribute if they wanted to be on peaceful terms with the Aztecs.
That is why the Tlaxcalans and other tribes such as teh Chilollans decide to join forces with Hernan Cortés and teh Spanish conquerors. Together, they showed strong opposition to the Aztecas. And that was a good advantage, considered that the Spanish conquerors had horses, spades, blades, and fire weapons that impressed the Native Indians.
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In 1609, two years after English settlers established the colony of Jamestown in Virginia, the Dutch East India Company hired English sailor Henry Hudson to find a northeast passage to India. After unsuccessfully searching for a route above Norway, Hudson turned his ship west and sailed across the Atlantic. Hudson hoped to discover a "northwest passage," that would allow a ship to cross the entirety of the North American continent and gain access to the Pacific Ocean, and from there, India. After arriving off the coast of Cape Cod, Hudson eventually sailed into the mouth of a large river, today called the Hudson River. Making his way as far as present-day Albany before the river became too shallow for his ship to continue north, Hudson returned to Europe and claimed the entire Hudson River Valley for his Dutch employers.