<span>A grassroots effort would be boycotting businesses that used slave labor. Boycotting a business means that you no longer purchase items from that business. The abolitionists no longer purchased products from businesses that used slave labor, thus decreasing the sales of those businesses, and hitting them economically. This is an effective means of making change if enough people are on board.</span>
A "municipality" is a unit of local government incorporated by the state. The powers vested in this entity can range a great deal, but in general they are subordinate to the state.
The general relationship between Gross Domestic Product (GDP) and the Human Development Index (HDI) is that they are usually "tied together", in that when one goes up so does the other. This is because countries with greater wealth usually have populations with greater life expectancies.
Henry Kissinger was the American who negotiated the cease-fire with North Vietnam, essentially ending the United States involvement in the conflict between the North and South Vietnam. The correct option among all the options given in the question is option "c". He was also the United States Secretary of State during the time in which Richard Nixon and Gerald Ford were the presidents.
