Answer:
B. ''Flood Wall"
Explanation:
After the tragedy the U.S. Army Corps of Engineers, which had built most of the levees and floodwalls, began an extensive campaign to repair them
A raw material or primary agricultural product that can be bought and sold, such as copper or coffee.
Or
a useful or valuable thing, such as water or time.
2: South Carolina was the first state to secede the Union. Lincoln viewed this as a threat to democracy.
3: Robert E. Lee was a confederate general who was very important to the Civil War because he commanded all of the Confederate armies and was extremely skilled.
4: Ulysses S. Grant was a Union general who was important because he led the Union Armies to victory over the Confederacy.
5: The assassination of Abraham Lincoln hurt reconstruction because Andrew Johnson took over and he was lenient towards slave states and against blacks gaining rights which halted progress and healing.
Hope that helps :)
The Garamantes provided the Romans with foodstuffs, exotic Sub-Saharan slaves & possibly textiles, salt, gold & ivory in exchange for Roman wine, olive oil & pottery. ... Although a large amount of Sub-Saharan goods made it to the Mediterranean, Mediterranean goods did not reach the Sub-Sahara in the same volume.