The Spanish had horses, guns, metal armor, and they brought lots of foreign diseases with them
1) Foreign Invaders. In 410 AD Alaric, King of the Visigoths sacked Rome. In 476 Odaecer, a Germanic leader organized a revolt deposing Emperor Romulus Augustulus. This year is the one marked as the Fall of the Roman Western Emoire. ; 2) Corrupt government added to the problem and Romans lost faith in the governmental leadership.