Which statement about the pacific theater in world war 2 is true?
a: guadalcanal was chosen by american planners for invasion because of its pleasant climate and open terrain

b: at the battle of midway, japanese planes four american aircraft carriers
c: after the battle of the coral sea japanese forces invaded and captured australia.
d: navajo indians in the u. s. marine corps developed an unbreakable code using their native langauge

D: Navajo indians in the U.S. Marine corps developed an unbreakable code using their native langauge

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.