Which is an invention that improved safety for railway passengers? O refrigerated rail cars
O Pullman sleeping cars
O time standardization
O air brakes

Select the correct answer. what are concurrent powers? a. powers granted solely to state governments b. powers granted to the national government c. powers transferred between government leaders d.powers shared between national and state governments

Which of the following is not a true statement about the inca? a. they conquered the maya. b. they had a highly organized military. c. they mummified deceased royal-family members. d. they built cities and fortresses on the highlands of the andes mountains.

If any state tribunal decides a federal question and the litigant has no further remedy within the state court system, from which of the following remedies could the litigant possibly benefit? a.a hearing by a us district courtb.a hearing by a federal court of appealsc.a hearing by the us supreme courtd.a congressional vote b, the correct one!