Answer: b
Explanation: because southern states did not allow civil rights movement
South Carolina wanted to secede because of President Lincoln and it means that they wanted to withdraw from the union <span />
Answer:
Ever since Columbus set foot in the Americas, the number of endemic species, that is to say, species that only live in a specific geographical area has diminished, while other species have thrived, in the five continents.
For example, the Columbian Exchange led to the cultivation of a South American crop: the potato, across Europe and Asia, where millions of people in cold climates where able to avoid famine by feeding themselves with it.
Another biological homogeneization process occurred with disease vectors: before the Columbian Exchange, diseases such as measles or smallpox were unheard of in the Americas. When Europeans arrived, Native Americans did not have defenses against this illnesses, and the majority of them perished because of contagion (over 90%).
Nowadays, these diseases are present all over the world, but thanks to vaccines, they do not kill as many people as before.
The ancient Mayan civilization was one of the most influential in the modern's day history, and it used to live in what we know as Central America nowadays. This region includes the countries of Guatemala, El Salvador, Honduras, Belize and 5 states of Mexico: Campeche, Chiapas, Quintana Roo, Tabasco and Yucatán.