What was the main acheivement of genghis khan and the mongols?

The unification of Mongolia and the invasion and domination of China.

Explanation:

The Mongol Empire is considered to be one of the largest in history in continuous land extension: it ranged from the western border of Germany to the Korean Peninsula, and from the Arctic Ocean to Turkey and the Persian Gulf, dominating about a third of the population total of the planet at the time. It began in 1206, when a warrior named Temujin was proclaimed Genghis Khan, the supreme sovereign of Mongolia. Using strategies of war and politics, the leader was responsible for the unification of the numerous nomadic tribes that inhabited the region and resembled customs and language.

After the unification of Mongolia, Genghis Khan's first target was China. Armed with a skillful, organized and disciplined army, he crossed the Great Wall and surrendered Beijing in 1215. Between 1221 and 1225, in unceasing campaigns, the Mongols advanced upon the Muslim states and became masters of an empire that stretched as far as the Persian Gulf

overtime, the civil rights movement changed in a way that not only it benefited african-americans, but benefited other ethnicity's such as latinos, asians, or women too! that's why the results of the movement be called mixed.

the civil rights movement brought about tremendous changes. no longer were blacks denied the right to vote, to eat, shop, and swim where they , and more importantly, to attend integrated schools. despite its many accomplishments, however, the civil rights movement had its shortcomings. for example, many people, both young and old, lost their lives, homes, jobs, and families. still other individuals were so damaged by psychological trauma that they ceased being productive members of the community. the movement left intact the economic inequities that had contributed to the maintenance of segregation. and finally, racism remained alive and well long after the movement's end. like most movements of its kind, the civil rights movement left behind a mixed legacy of triumph and tragedy.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.