I'm late as always, sorry for being late.
Answer:
The boycott and protest was led by Martin Luther King Jr and this was because of the discrimination of a black lady called Rosa Parks in a bus in Montgomery.She was arrested for not giving up her seat for a white person to use. The blacks decided to boycott the usage of the buses for several months. The boycott was later called off when the Supreme Court pointed out that the segregation was unconstitutional.
Yes, the citizens of Montgomery as well as those of the US Supreme Court was necessary for its success.
<span>The US is a mixed economy, with mostly free market features. There are some command economy features, such as a public military, public police forces, public roads, etc</span>
John Calhoun argued that the 1828 tariff helped the North at the expense of the South (c). This was the case because the tariff bolstered Northerner industrial markets but required Southerners to pay more for manufactured good.