<span>The more sources there are to verify a conclusion, the more probable that conclusion is to be valid. You should know about the handy difficulties engaged with recreating crafted by others, and the significance of finding numerous sources about a theme should be stressed.</span>
Sources are used in a paper to show what ideas inspired you and whose theories you would be using and you cite the sources in order to avoid plagiarism. If you don't have sources, your paper will not be valid and you could get accused of plagiarism. The more sources you use the better but you should keep in mind that they need to be important for the paper and used with a purpose and not just to increase the number of sources.
<span>The site of a major French military defeat in 1954 in Vietnam; French pulled out of Indo China; other countries from the West had to take a stand on Communism in Vietnam</span>