Why was the Caribbean called the "Great American Lake" in this time period?

The history of the Caribbean reveals the significant role the region played in the colonial struggles of the European powers since the 15th century. In 1492, Christopher Columbus landed in the Caribbean and claimed the region for Spain. The first Spanish settlements were established in the Caribbean starting in 1493. Although the Spanish conquests of the Aztec empire and the Inca empire in the early sixteenth century made Mexico and Peru more desirable places for Spanish exploration and settlement, the Caribbean remained strategically important.