The modern world is a very different place from the world that existed 50 years ago. Our knowledge of ourselves and our universe has increased, infrastructures have become globalized and technological developments have revolutionized the way we communicate with each other.
Have you looked it up online
The Mayans used a pyramid and the sun to help them create a calendar.
B Adolf Hitler is the answer
The Homestead Act of 1862 mainly affected c) the westward settlement of farmers. The Homestead Acts are defined as "several United States federal laws that gave an applicant ownership of land, typically called a "homestead", at little or no cost."