TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: Who were the Spanish monarchs that financed Christopher Columbus?, Context: The 1469 marriage of Isabella I of Castile and Ferdinand II of Aragon and the 1479 death of John II of Aragon led to the creation of modern-day Spain. In 1492, Granada was captured from the Moors, thereby completing the Reconquista. Portugal had during the 15th century – particularly under Henry the Navigator – gradually explored the coast of Africa, and in 1498, Vasco da Gama found the sea route to India. The Spanish monarchs met the Portuguese challenge by financing the expedition of Christopher Columbus to find a western sea route to India, leading to the discovery of the Americas in 1492.

SOLUTION: Isabella I of Castile and Ferdinand II of Aragon

PROBLEM: What does the S in "OAS" stand for?, Context: Further conventions were adopted at the regional level under the aegis of the Organization of American States (OAS or OEA), the African Union, and in 2003, at the universal level under that of the United Nations Convention against Corruption.

SOLUTION: States

PROBLEM: What was done to regain power?, Context: With the defeat of the Confederacy in 1865, the Reconstruction Era began. The United States abolished slavery without compensation to slaveholders or reparations to freedmen. A Republican Party coalition of black freedmen, northern carpetbaggers and local scalawags controlled state government for three years. The white conservative Democrats regained control of the state legislature in 1870, in part by Ku Klux Klan violence and terrorism at the polls, to suppress black voting. Republicans were elected to the governorship until 1876, when the Red Shirts, a paramilitary organization that arose in 1874 and was allied with the Democratic Party, helped suppress black voting. More than 150 black Americans were murdered in electoral violence in 1876.

SOLUTION:
The white conservative Democrats regained control of the state legislature in 1870, in part by Ku Klux Klan violence and terrorism