How did Puerto Rico become a colony of the United States?

http://revcom.us/a/v20/960-69/966/prhist.htm
Click on the above link to read a short history about how Puerto Rico became a colony of the United States.

In this short history, you will read that the United States intends to keep Puerto Rico as her colony forever.  This is why it is imperative that we protest continuously for Puerto Rico decolonization until we achieve it!  Obviously, those who have practiced 115 years of Puerto Rican colonialism do not believe in justice for all.  Therefore, if we do not protest peacefully, Puerto Rico will never be decolonized.

On Saturday, November 23, 2013, we will have a peaceful protest in Puerto Rico for the liberation of our patriot and Puerto Rican political prisoner Oscar Lopez Rivera.  He is the longest held political prisoner in the world!  Who would have thought that the United States government would own that distinction!  We will march at 1 PM from the United States Court in Puerto Rico to the Hiram Bithorn Stadium in Hato Rey.  We would be honored if you would join us for this act of indignation to violation of human rights to Puerto Ricans.