What was one of the greatest problems that arose in constructing the panama canal?

How did the union blockade of the southern coast affect the confederacy? it forced the confederacy to build new railroads. it contributed to shortages of weapons and food. it encouraged europe to trade with the south. it halted all trade, leaving the south without supplies.

Who issued the ruling for the supreme court? dred scott roger b. taney abraham lincoln john c. calhoun

Why was the treaty of versailles harsh on germany?