Answer:
Technologies and weapons are the positive while diseases are the negative impact of Europeans on the future of America.
Step-by-step explanation:
The positive impact of Europeans had on the future of the Americas was that they brought technologies, weapons, animals and plants etc to America. They also introduced Christianity in the people of America. The negative impact of Europeans was the spreading of dangerous diseases like smallpox, Syphilis and measles etc which killed a large population of America due to no defense mechanism because these diseases were new to them.