What is the primary power of congress

Who were some of the first people to use prostheses?

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.

Who were the main leaders of the major powers (france, england, and great britain) during the treaty of versailles?