During the age of exploration, primarily explorers traveled across the atlantic and pacific oceans and first encountered civilizations in the americas

The missing word is European

During the age of exploration, primarily European explorers traveled across the Atlantic and pacific oceans and first encountered civilizations in the Americas.

Explanation:

The so-called Age of Exploration was a period from the early 15th century and continuing into the early 17th century, during which European ships were traveled around the world to search for new trading routes and partners to feed burgeoning capitalism in Europe.

Europeans began to sail west across the Atlantic Ocean in search of new routes to China and the East, but in the process they discovered an entirely New World: North and South America, plus many other lands.

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