What most helped spain defeat the aztec and incan people?

Superior Weapons, Spanish weaponry was far superior to anything used by the Aztecs or Incas, Alliances and Experience, The Power of Horses, and Deadly Disease.

Hope this helps

The spread of disease, better weapons and fighting tactics, calvary, experience, and spreading fear.

Explanation:

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)