Answer:
A
Explanation:
Going of by this is why I said A but don't take my word for it
The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism. This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land.
The migration in the 1980's changed by how it increased so dramatically.
Answer:
Christopher Columbus, a Genoese captain in the service of the Crown of Castile, set out on his first voyage in August 1492 with the objective of reaching the East Indies by sailing west across the Atlantic Ocean. As is well known, instead of reaching Asia, Columbus stumbled upon the Caribbean islands of the Americas.
<em><u>Hope this helps! :)</u></em>
The four main of what? can I get more of the question.