Answer:
The Zimmerman note and unrestricted submarine warfare by Germany
Explanation:
The Zimmermann Telegram was a note from German official to offer military alliance between Mexico and Germany. President Wilson understood the diplomatic relation and broke off the relation and decided to enter the WWI.
Germany was repeatedly attacking U.S. by submarine warfare in the Atlantic that killed ore than 120 U.S. citizens on May 7, 1915 that provoked outrage in the U.S. to participate in WWI.
Hence, the two reason are The Zimmerman note and unrestricted submarine warfare by Germany.
The major purpose of the master document is to manage the long documents that contain many chapters or sections. So, none of the above choices is correct.
<h3>What do you mean by master document?</h3>
A master document refers to a document that contains many chapters or sections or when it becomes unmanageable in a single document.
A master document contains special links for the documents.
Therefore, D is the correct option.
Learn more about the master document here:
brainly.com/question/15627895
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Answer:
Economics is the study of how humans make decisions in the face of scarcity.
Explanation:

Answer:
Christopher Columbus and Ferdinand Magellan explored the coasts of Africa, found a sea route to India, and revealed the existence of the Americas.
Explanation:
Those are all things that contribute to exploration.