Westinghouse designed an air brake that made rail travel safer, and his promotion of an alternating current system revolutionized the power industry. ... His time in the army made him realize the importance of railroads to the national project of industrialization.
Answer:
Primary source
Explanation:
The primary sources provide first-hand evidence of an event, person and object. They are contemporary to the people and events. Whether something can be considered as a primary source or not depends on the context of the source which is being examined by you. To determine a primary source one can ask several questions such as who created the source, what is the source about and when was it created and the targeted audience of the source. Speech, newspaper articles, photographs, and govt documents are some of the primary sources.
:brazil was a monarchy rather than a republic
