Answer:
Complex Calendars.
Explanation:
The Mayans were one of the first to create calendars, using observatories to take note of the stars and how they "rotated the earth". Using such, they could determine the approximate time as well as seasons.
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Building through the Sierra Nevada Mountains was very difficult and dangerous. Temperatures were freezing during the winter and in one year alone there were 44 storms.There was the great danger of an avalanche for the men working through 18 feet of snow and camping on the tunnels beneath it. Creating tunnels through the mountains required blasting with nitroglycerin. Advancing at one foot of mountain at a time, a total of 11 tunnels was created.
The African Americans had to do the chores for the white men, basically a maid but not paying. Some people tried to free the slaves like Harriet Tubman, the most well known person to.
The answer is C. Hope that helped!
Answer:
the 13th amendment abolished slavery
Explanation:
this is bad but oh well