The columbian exchange was.. a) The agreement that documented what Christopher Columbus would give to Spanish leaders in return for their sponsorship of his travel to the New World
b) The transatlantic flow of plants, animals, and Germs that began after Christopher Columbus reach the New World
c) john cabot’s exploration of the New World, which brought more of the goods that Columbus had found back to the old world
d) The first store in the New World, established by John Cabot and named for Columbus

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

i would have to say i believe that it is a.

naturalization is the process of gaining united states citizenship. becoming an american citizen is the ultimate goal for many immigrants, but very few people are aware that the requirements for naturalization have been over 200 years in the making.