Answer:D
Explanation:
because The United States and Russia were at Cold war and having Cuba close to The US was dangerous since Russia could plant missiles aimed at the US
<u><em>Native Americans</em></u> and <u><em>Europeans</em></u> were great explorers in the 1490's. <em>Europeans</em> adventurers came to a continent that was an unknown place to them. They saw it as an entirely new territory, with new species to discover. They met new people with surprising ways of living and a totally new culture and beliefs. <u><em>Native Americans</em></u> also arrived at different times, over several thousands of years. They traveled from Asia on foot or by boat, crossing the Bering Strait. Their explorations took them through icy landscapes, deserts, forests, swamps and along the coastlines. After some time, these <u><em>native American</em></u> explorers spread out over the entire continent, until the territories of Patagonia, in the extreme south. Adventure and conquest of new land was one characteristic that <em><u>Europeans</u></em> and <u><em>native Americans</em></u> had in common at that time.
Dr. J. Craig Venter became leader in the field of medical research when A) He combined research with Dr. Francis Collins to help map the human genome.
They were called the Confederates.
