The Long March took place from October 1934 - October 1935. It meant that communism was not completely wiped out by the Kuomintang, that the people of China learnt about communism and supported the communists, that the Kuomintang got control of the south of china and most of the communists died from illness, exposure and Kuomintang attacks.
At the time it was significant because otherwise all the communists would have been annihilated. Its effects were not seen immediately but in the short term still it allowed the communist army to gather their strength and troops and meant that when they tried to take back the country the ordinary people of China knew about communism and its benefits and would support them over the Kuomintang. This also meant that when the Japanese invaded in 1936 they were strong enough and had enough support to fight and defeat them.
In the Long term however, after 1949 when China was declared communist the Long March did not really have many effects. It was used in propaganda, as an example of the strength and determination of the communists but other than that it had no direct effects.
The Revolution of the Double Tenth in 1911 was another event in the history of China. As a short-term cause it meant that China was free of imperial rule and became a democracy. It also led to the setting up of the Kuomintang and freedom from the tyranny of the Emperors. However, like the Long March for ordinary people it did not make much difference. Instead of being oppressed by the Emperors they were still living in poverty, oppressed by the Warlords.
In the long term the Revolution of the Double Tenth meant that different political parties could be formed, including the Kuomintang and the Chinese Communist Party. It opened the way for change so that different ruling parties could have the chance to make a difference to China and gave more importance to the ordinary people of China, not just the Aristocracy.
In 1949 Communist China was formed. In the short term this was very significant. Whereas the Long March and the Revolution of the Double Tenth did not really improve the lives of the ordinary people in the short term, this event lead quickly to land being divided between the peasants and the old cruel landlords being persecuted and punished. The communists helped the country recover from the damage the civil war had caused enough that extra food grown could be sold and government controlled factories could produce goods to sell in the first of Mao Zedong's '5 Year Plan's. However the communists wanted everyone to be equal so everyone was paid the same, whether they worked or not. This meant everyone did as little work as possible and were all equally poor instead of equally rich.
Also, unlike the Long March and the Revolution of the Double Tenth where different political parties were set up or protected as part of the...