Answer:
A
Explanation:
The letter is a primary source, while the encyclopedia entry is a secondary source.
<span>The musical capital of Europe during the Classical Period was Vienna. During this time period, many great artists were discovered, such as Mozart. Composers like Mozart, Haydn and Beethoven were drawn to the city by citizens of Habsburgs who were willing to support the music.</span>
Tabacco, indigo, and rice
The U.S. played a substantial role in the evolution of the Mexican Revolution. It supported the anti-reelectionist movement, agreed with Bernardo Reyes and Félix Díaz's revolt against Francisco I. Madero, helped the revolutionaries defeat Huerta, and invaded Veracruz in 1914.
The Silk Road passed through 43 countries