This answer is a. True.
hope it helps :)
Advancements in the economy helped the economy because as things were invented, people wanted to make their lives easier. Or another thing was certain advancements allowed the ability to produce product in large amounts to sell. For example the printing press could allow books to be purchased at a faster rate.
The answer is: effective secondary source document"
Within 20 years, historians would have enough time to gather all facts and data from all sides that involved in historical event. All of these facts and data is useful for them to decipher how the historical events were unfolded.
This make the chart an effective source to find for information regarding the event. But, since it does not made by people who actually involved in the events, it could only be considered as a secondary source.
The answer to the question above is radio and phonograph.
The radio and the phonograph are the technology that was introduced in the late 1800s that aided in the spread of jazz music to all parts of the United States and the world.
