Amajor reason for the end of the aztec empire was

The Aztec people lived in what is now Mexico.
They had a sophisticated civilization, They
founded their capital of tenochtitan in 1325.
The Spanish
whom are more sophisticated in weaponry than the Aztec's at the time.
The Aztecs controlled a wealthy, powerful empire of hundreds of states.

Hernan Cortes
Hernan Cortes was a Spanish conquistador that sought adventure
and wealth, became a leader in Cuba, and led an expedition to Mexico.
He also claimed land for Spain and ended the Aztec empire.

Cortes's
forces conquered the Aztec people using two methods.
Capturing Montezuma (Aztec emperor)
Defeating the Aztec in battle.

Inca Accomplishments
The Inca had a large, successful empire in western South America.
Including the civilization structure such as palaces and temples.
They had a vast system of Roads.

Inca Civil War

Conflict within the Inca empire gave Spain the opportunity
to take their land. They were fighting over who would be the next
leader. These political problems led to weakness.

Ithink the answer is a.