D
The railroads were finished in Promontory, Utah
Increasingly warm relations with the Triple Entente, and the sinking of the RMS Lusitania.
James Madison had one of the most powerful influences of the writing of the Bill of Rights. Hope that helps!
Hippocrates studied the causes of illnesses.
Socrates invented a teaching method that involved asking questions.
Eratosthenes determined that the Earth was round.
Aristotle educated Alexander the Great.
Answer:
it was a method used by Incas and other ancient Andean cultures to keep records and communicate information
