What are some challenges in the countries of the Tropical North?

How did rhe transcontinental railroad effected westward migration

Is this statement true or false? before 1850, workers in american mines, mills, and factories were poorly paid, but their safety on the job was always protected by strict laws.

Identify the type of source based on the information provided. a historian found a journal belonging to an ancient indian princess. the princess liked to keep a record of all the royal women of her dynasty who lived before her time. she tried to collect as much accurate information about their history as possible. her journal is a great source of historical information. based on the passage, the princess’s diary is source.