Final answer:
Europe's changes in the 1400s impacted European states' ability to launch Atlantic expeditions through advancements in seafaring and unification of Spain.
Explanation:
Changes in Europe during the 1400s significantly influenced European states' ability to launch expeditions of discovery in the Atlantic. The fall of Constantinople to the Ottomans and the unification of Spain played crucial roles in this process. European monarchs invested heavily in their navies and maritime technology, leading to exploration beyond their shores for new markets and routes.
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