Why do we not have more information about the indus valley civilization?

a.
most archaeologists and historians prefer to work on the mesopotamian and egyptian civilizations.

b.
only one ancient city in the indus valley has been discovered and explored.

c.
archaeologists and historians have been unable to decipher any of the indus valley writing.

d.
the ancient peoples of the indus valley purposely obscured evidence of their existence.

The answer is "C"

The main reason why historians don't have a lot of information on this is because the people of the Indus river valley wrote in a language that historians today can't figure out what it means.

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.