How were the pyramids built? what was their purpose?

In the first half of the 20th century,literacy tests,poll taxes, and grandfather clauses were passed by the southern states in order to

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

What is the term for a short statement about history that has not been yet been proved