Step 1: Build Artificial Island within the nine-dash line.

Step 2: Claim the Island for the USA

Step 3: ???

Step 4: WW3?

… enables citizens of the United States to take possession of unclaimed islands containing guano deposits in the name of the United States. The islands can be located anywhere, so long as they are not occupied by citizens of another country and not within the jurisdiction of another government. It also empowers the president to use the military to protect such interests and establishes the criminal jurisdiction of the United States in these territories…

Well, that sounds shitty.