Answer:
The battle of gettysburg.
Explanation:
The objective of the Spring Offensive in March 1918 was to defeat French and British armies on the Western front, which would cause Germany to win total victory if it went as planned
I think the answers are B,and D
ANSWER: Indus Valley
Many historians believe the Indus civilization collapsed because of changes to the geography, climate of the area, halted trade with Mesopotamia, and Aryan invasions.