Well..... The <span>Colombian Exchange was a worldwide transfer of goods such as animals and plants. This trade was between Europe and North America in 1492. Unfortunately the exchange brought diseases such as smallpox malaria and measles. This also lead to lots of death to both the natives and the Europeans.
</span>
The main purpose was t<span>o prevent communism from spreading to new countries.</span>
<span>The answer should be The United States Constitution</span>
