At the time the great European powers were all in a race to take the most land (and Britain won). Britain also had the best navy and could project power. Britain won some wars against European nations and took their colonies. During that time the "United Kingdom" for formed. And Company Raj (Company Rule) with the East India Company in India made Britain more and more wealthy. After all, if you control much of the world you can get very rich and control much of the trade. Britain also had a lot of Soft Power in addition to its hard power (the military).
People who supported imperialism claimed that it was the natural progression of civilized countries and races to expand. Expansion in a way became a matter of race. Americans were part of the great Anglo-Saxon race, which means that, like their English cousins, they were of a superior race and destined for an empire of their own.
Explanation: Long battle
The Long March most commonly refers to the transfer of the main group of the First (or Central) Red Army, which included the leaders of the Communist Party of China, from Yudu in the province of Jiangxi to Yan'an in Shaanxi. In this sense, the Long March lasted from October 16, 1934, to October 19, 1935.
The Communists, under the eventual command of Mao Zedong and Zhou Enlai, escaped in a circling retreat to the west and north, which reportedly traversed over 9,000 kilometers (5600 miles) over 370 days.
