This document provides an overview of Christopher Columbus and other early explorers of the Atlantic World. It begins with background on Columbus' voyages across the Atlantic Ocean in 1492-1493. Students then analyze a primary source letter from Columbus describing the landscapes and native people he encountered. The document continues with discussions of Portuguese explorers like Pedro Alvares Cabral, Amerigo Vespucci, and Ferdinand Magellan, noting their discoveries and impacts. It concludes with assessment questions asking students to analyze the biggest impacts and potential dangers faced by these early explorers.