The document summarizes events in Europe, Asia, Africa and the Americas in the year 1492. In Europe, Ferdinand and Isabella united Spain through marriage and conquered the last Muslim outpost of Granada. In Asia, the Chinese emperor banned merchants from traveling abroad while Japan was explored by Marco Polo. The Aztec and Maya empires dominated Mesoamerica but lacked naval power. European exploration was spurred by the need for Asian goods like spices normally under Muslim control.