Almost all of the works of classical era included vocal parts

False.

Explanation:

Classical music is often distinguished by the wide use it makes of musical instruments of different timbres and tonalities, creating a deep and rich sound. The different movements of classical music were affected mainly by the invention and modification of these instruments over time. Although classical music does not have a "set" of instruments necessary for certain standards of its execution to be fulfilled, composers write their works with different instrumental ensembles in mind. Vocal parts are not a mandatory element, but they can complement bringing more meaning to the work.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.