1. Columbus's journeys had the long-term effect of a. Connecting the cultures of Africa, Europe, and the Americas. b. Isolating Europe from the rest of the world. c. Allowing Spain to economically destroy other European nations. d. Uniting the Indian population of the Americas with Spain into a powerful military alliance.

d. Uniting the Indian population of the Americas with Spain into a powerful military alliance.

Explanation:

Colombus was a Spanish explorer who worked for the crown of his country in search of wealth that would fortify Spain. on one of his trips, Colombus discovered the American continent and soon looked for ways to explore it in favor of the Spanish crown. Colombus' discovery was very successful and in the long run promoted several advantages for Spain, including the alliance between Native American tribes and Spain. This alliance was not made peacefully, but it was established promoting an optimization of the Spanish military force.

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