Explanation:
It was one of the most contentious presidential elections in American history, and gave rise to the Compromise of 1877 by which the Democrats conceded the election to Hayes in return for an end to Reconstruction and the withdrawal of federal troops from the South.
Ronald Reagan (the candidate of the republican party) defeated former vice president Walter Mondale (the candidate of the democratic party) in the 1984 presidential elections.
The Great Pyramid of Egypt located in Giza is the largest pyramid in the world. It is also included in the list of the Seven Wonders of the World. Pyramids were builts by slaves for their pharaohs or kings. Royalties were mummified when dead and buried with their treasures. It was believed that when pharaohs die, part of their spirit remain in their bodies. Hence, pyramids were built to take care of the spirit.
The answer is The agricultural Revolution.