In december 1937, the japanese forces invaded and carried out destructive military operations over a period of .

In December 1937, the Japanese forces invaded Nanking and carried out destructive military operations over a period of 6 weeks.

Nanking is the capital of Jiangsu province of China and also the second largest city in the East China region.

In December 1937, in the context of the Second Sino-Japanese War between Japan and China, Japanese soldiers marched on the Chinese capital city of Nanking. Most Chinese residents fled Nanking, though the number of people within the city was increased by the presence of a large garrison of Chinese soldiers defending it. In the aftermath of the fall of the city on December 13, 1937, Japanese soldiers massacred Chinese prisoners of war and civilians in and around the city.

the answer would be:

b. race

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: