What was significant about the Emancipation Proclamation turning the war into a moral cause for abolition?
Prevented European intervention on the side of the south
Creates the first desegregated military
O Increased the popularity of Jefferson Davis
O It would lead to volunteers filling the ranks of the Union Army

i feel like the answer is it prevented European intervention on the side of the south

Explanation:

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

silk

indigo  

rice

all the other answers are wrong