The demand curve for bell-bottoms __shifted to the right__ its the simple answer, but besides that, it can be said that the demand for these pants, which had been used by the navy for a long time, quickly became fashionable among hippies, first used by women and then by men, until singers and artists began to use the bell bottoms and their popularity grew so much that they have become a symbol of disco nights in the 70s.
In battleground states, they will be more competitive. therefore, people of both parties will feel inclined to run and parties will put more money into flipping them or winning campaigns to show their strength.
The reason why Harriet Beecher Stowe published her book is to show and highlight the evilness inside of slavery and how it is effecting lives. In doing this, she actually angered the Southern-Slave holders and they ended up inspiring the slave trade even more than before.
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The correct answer here is the public opinion.
All of the methods mentioned here are ways the politicians may test and see the public opinion. Polls are maybe the main indicator of the public opinion next to voting results but at stage it is a bit late for the candidate. Direct contact with the population is also a method by which the politicians can learn what troubles the said population.