Because their colonies will separate from them thus its power and resources will decrease. Hope that helps.
Del Verrocchio was Leonardo Da Vinci's teacher or master artist. He retired because he thinks he could not paint as well as Da Vinci. Though Del Verrocchio, Da Vinci would have been exposed to both theoretical training and vast variety of technical skills.
Yes he did I d k but I can not remember at all so look it up
No main purpose was fur trading
