Which technological innovation had the most direct impact on european exploration in the 15th century

the navigational compass

A compass is a tool that is used for navigation and relies on magnetism to work. The first practical compass that appeared in Europe seems to have been made in Venice in 1274. The compass seems to have derived from the lodestones that were used by Chinese merchants in their trips. Around the early 1300s, sailors began using the dry compass extensively, and over the next centuries, it played a significant role in the Age of Exploration.

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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d.) continue to rise rapidly