Why were mobile gas vans invented?
a. to provide a less painful and traumatic death for the victims
b. to make killing more impersonal for the nazi soldiers
c. to increase efficiency
d. to eliminate the handicapped
e. to kill jewish women and children

The correct answer is b. To make killing more impersonal for the Nazi soldiers.  These vehicles were developed when the most effective forms and methods for the mass murder of Jews were investigated. The exhaust gases were used to kill people by inhaling carbon monoxide by trailers or gas chambers called Gaswagen.

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.

the speech revealed that eastern european countries were no threat to their neighbors, which led to the creation of the truman doctrine i think this might be correct.