Austria declared war on Serbia in a calculated response to the murder of Archduke Franz Ferdinand. There was much blame on both sides as to why war came about and what the true cause was, but the murder was the reason used.
Answer:
The Civil War.
Explanation:
The south states protested to ban slavery.
Hope this helped... had the roughly do internet research
Answer:
C. Stock Market Crash
Explanation:
The Stock Market Crash of 1929 which was then worsened by the 1930s Dust Bowl (a huge dust storm that destroyed crops and brought severe drought).
The most urgent need was coal and iron.