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

The internal combustion engine was an innovation of

Which of these events was a severe setback for the u.s. war effort in the pacific?

June 19 is often a holiday in texas. it is emancipation day. what important event happened on emancipation day? a) it marks the end of slavery in texas. b) it marks end of the texas revolution. c) it marks the day texas became a state. d) it marks the last battle of the texas revolution.