What kind of changes in science and economics made european exploration possible

Native Americans provided fur pelts to French and Dutch traders. The Europeans gave Native Americans manufactured goods, like cloth, iron cookware, guns and tools. The fur trade in the end, had a negative effect on the Native Americans. The French made an alliance with the Iroquois, and Dutch made an alliance with the Hurons. Yet, before the Hurons became trading partners with the French, the Iroquois, and Hurons were enemies.

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!