Automotive was a huge development in 1950s and was important because it was a area we were slacking on.
The Proclamation announced the acceptance of black men into the Union Army and Navy, enabling the liberated to become liberators
The correct option is B.
The second industrial revolution occurred between 1870 and 1914. During this period, there was massive advancement in technology and in factories and this made it possible for manufacturers to produce a lot of goods en mass. The industrial revolution started in Britain and rapidly spread to Europe and North America an then to the rest of the world.
I believe the answer is A. Correct me if i'm wrong :)