Answer:
Telescopes.
Explanation:
Galileo was a natural philosopher, astronomer, and mathematician who made fundamental contributions to the sciences of motion, astronomy, and strength of materials and to the development of the scientific method. He also made revolutionary telescopic discoveries, including the four largest moons of Jupiter.
The Maya were native people of Mexico and Central America, while Aztec covered most of northern Mesoamerica between c.1345 and 1521 CE, whereas Inca flourished in ancient Peru between c.1400 and 1533 CE and extended across western South America.
The different African colonies aren't united because of their languages, religion, and culture. Because of this, European armies are large and can easily take over the small African colonies because they don't like eachother and won't put their powers together for the greater good.