Read the passage from an argumentative essay. "The Columbian Exchange was bad. It had many effects on native peoples. One of these effects was disease. Disease harmed people. It led to death. Some say up to 90 percent of native peoples died.”

How should the passage be revised to create a more formal tone?

Slang terms should be removed.
First-person pronouns should be added.
Simple sentences should be balanced with more complex ones.
Long and complex sentences should be split apart and made shorter.

The Columbus Exchange was a very negative event that had many impacts on natives for what I can see. A very important and major impact this caused was a spread of a disease called smallpox. This disease infected many people part of their community as lead to death in many causing there population to decline quickly. People have even been said to believe that 90% of the natives who got infected with this disease died which can show that it was very deadly. Lucky we do not have to worry about this horrible disease.

It's a gift from god that allows people to bear witness to horror.